Best Herb Grinders of 2026: Sizes, Pieces and What to Actually Buy

Grinders are the least glamorous purchase in smoking and the one that quietly decides how good everything else works. An even grind means even airflow, which means an even burn, which means you get what you paid for out of every bowl. An uneven grind means chunks that refuse to light sitting next to dust that scorches instantly.

The good news is that buying one well is simple, because only two things actually matter: what size you get and how many pieces it has. Almost everything else on a spec sheet is marketing. Below are seven grinders from the AFM lineup ranked against those two decisions, plus a plain explanation of how to make them.

The Two Decisions That Matter

Size. This is the one people get wrong. Too small for how you actually smoke and you will grind three separate times in a session. Too big for a pocket and it stays on a shelf at home. Grinder size is measured across the diameter in millimeters: 40mm, 50mm, 63mm and 100mm in this lineup.

Piece count. This decides whether you collect kief. A 2-piece grinds. A 3-piece separates ground herb into its own chamber. A 4-piece adds a screen and a kief catcher. A 5-piece adds a second screen for finer separation. People searching for a “5 chamber grinder” usually mean a 5-piece.

Everything else — tooth pattern, lid style, colour — is preference. Get size and piece count right and you will not think about your grinder again for years.

Quick Comparison

Grinder	Size	Pieces	Best for	Price
Sir Shredalot 4-Piece	63mm	4	Best overall	$19
Sir Shredalot Curve Top	40mm	4	Best pocket grinder	$15
Sir Shredalot 4-Piece	100mm	4	Best large capacity	$19
AFM 5-Piece Premium	Multi-chamber	5	Best for kief	$29
Sir Shredalot Crank Top	63mm	4	Easiest to turn	$19
Sir Shredalot Window Chamber	63mm	4	Best kief visibility	$19
Sir Shredalot 2-Piece	63mm	2	Simplest option	$19

The Picks

1. Best Overall: Sir Shredalot 4-Piece Herb Grinder, 63mm

63mm is about two and a half inches across, and it is the size that suits the most people. It holds enough for a full evening without regrinding, it is big enough to get real leverage when you turn it, and it still fits in a hand comfortably. The 4-piece build gives you a screen and a kief catcher, which is the single feature most people wish they had bought.

If you are replacing a grinder and do not want to think about it, buy this one. See the 63mm 4-piece grinder.

2. Best Pocket Grinder: Sir Shredalot Curve Top, 40mm

At 40mm, roughly an inch and a half, this disappears into a pocket or the small compartment of a bag. The curved top makes it easier to grip and turn than a flat-lidded grinder of the same size, which matters when the diameter is this small and you have less leverage. Still a full 4-piece with a kief catcher.

The trade-off is capacity: this is a one-session grinder, not a prep-ahead grinder. See the 40mm curve top.

3. Best Large Capacity: Sir Shredalot 4-Piece, 100mm

100mm is just under four inches across and it is a genuinely different tool from the smaller sizes. One turn processes enough for a week of bowls. If you prep in batches, share with a group, or simply hate grinding, this removes the chore almost entirely. It also has by far the most leverage of anything here, so it turns easily even when packed full.

It is not going anywhere with you. This is a home grinder. See the 100mm grinder.

4. Best for Kief: AFM 5-Piece Aluminum Herb Grinder

The fifth piece is a second screen, and it does something specific: it sorts kief by particle size. The finer material passes through to the bottom chamber while slightly coarser trichome fragments stay in the middle. If you actually use your kief rather than just accumulating it, the difference in quality between the two chambers is noticeable.

At $29 it is the most expensive grinder here, and it is only worth it if kief is something you care about. If it is not, save the money and buy a 4-piece. See the 5-piece grinder.

5. Easiest to Turn: Sir Shredalot Crank Top, 63mm

A crank handle on the lid converts the twisting motion into a rotation you drive with one finger. If you have any wrist or grip issues, arthritis, or simply find twisting a packed grinder unpleasant, this solves it completely. It is the accessibility pick and it is genuinely better for anyone who grinds large amounts at once.

The handle adds a little height and can catch on a pocket, so it suits home use. See the crank top grinder.

6. Best Kief Visibility: Sir Shredalot Window Chamber, 63mm

A clear window in the collection chamber lets you see how much you have without unscrewing anything. That sounds like a gimmick until you have opened a grinder mid-session to check and spilled the contents. Same 63mm 4-piece build as the overall pick, with the window as the only difference.

See the window chamber grinder.

7. Simplest Option: Sir Shredalot 2-Piece, 63mm

No screens, no chambers, no kief. Herb goes in, ground herb comes out of the same space. There is a real argument for this: fewer parts means nothing to clean out, nothing to clog, and no fine material disappearing into a catcher you forget to empty. Some people genuinely prefer all their material staying in one place.

Buy this if you know you will never use kief. See the 2-piece grinder.

What Size Herb Grinder Should You Buy?

Match the size to your actual habits, not your aspirations.

• 40mm (about 1.6 inches) — Pocket carry, solo sessions, travel. One session at a time.
• 50mm (about 2 inches) — The everyday middle ground. Enough for an evening, still portable.
• 63mm (about 2.5 inches) — The most popular size. Group sessions, comfortable leverage, prep for a couple of days.
• 100mm (just under 4 inches) — Bulk grinding. Prep once, smoke all week. Stays at home.

If you are between two sizes, go larger. The most common regret is a grinder that is too small, not one that is too big.

2, 3, 4 or 5 Pieces?

Piece count refers to how many separate parts the grinder comes apart into, and each extra piece adds a stage of separation.

2-piece. A lid and a base with teeth. Ground herb stays in the grinding chamber. Simplest to clean, nothing to lose.

3-piece. Adds a collection chamber below the teeth. Herb falls through as soon as it is fine enough, which stops it being over-ground into dust.

4-piece. Adds a mesh screen and a kief catcher underneath the collection chamber. Trichomes sift through as you grind and collect over weeks. This is the standard recommendation.

5-piece. Adds a second, finer screen so kief is sorted by particle size. For people who actively use kief.

If you have never collected kief before, going from a 2-piece to a 4-piece is the upgrade people notice most.

Why Metal Instead of Plastic

Plastic teeth round off with use, and a dull tooth crushes herb rather than cutting it, which shreds the trichomes you are trying to keep. Plastic also wears down into the material you are about to smoke. Aluminum teeth hold their edge for years and the body survives being dropped on a hard floor.

We go through the full comparison, including anodising and why cheap metal grinders still beat expensive plastic ones, in why aluminum grinders are better than plastic.

How to Clean an Aluminum Grinder

A clogged grinder turns harder and grinds less evenly, and the fix takes ten minutes.

Tap everything out first, then work a stiff brush or a toothpick through the teeth and across the screen. For a deeper clean, take the grinder apart and soak the metal pieces in isopropyl alcohol for twenty minutes, scrub, rinse with warm water, and dry completely before reassembling. Do not soak any part with an O-ring for long, and never put aluminum in a dishwasher — the detergent will strip the anodised finish.

Freezing the grinder for fifteen minutes before you scrape the kief chamber makes the trichomes brittle and much easier to collect.

Herb Grinder FAQs

What size herb grinder should I get?
40mm for pocket carry and single sessions, 50mm as an everyday middle ground, 63mm for group sessions and the most comfortable leverage, and 100mm for bulk grinding at home. If you are torn between two sizes, go larger.

What is a 5 chamber grinder?
Usually another name for a 5-piece grinder: a lid, a grinding chamber, a collection chamber, and two screens feeding separate kief chambers. The extra screen sorts kief by particle size, giving you finer material in the bottom chamber.

Are metal grinders better than plastic ones?
Yes. Metal teeth machined from aluminum stay sharp for years, while plastic teeth dull and snap, and once dull they crush herb instead of shredding it. Plastic grinders also shed fragments into your herb as they wear.

Do I need a kief catcher?
No, but most people who have one would not go back. It collects the fine trichome powder that would otherwise stay stuck in the grinding chamber, building a reserve you can use to top off a bowl. Only skip it if you know you will never use kief.

How do I clean an aluminum herb grinder?
Tap out loose material, brush the teeth and screen with a stiff brush or toothpick, then soak the metal parts in isopropyl alcohol for about twenty minutes for a deep clean. Scrub, rinse with warm water, and dry fully before reassembling. Never put an aluminum grinder in a dishwasher.

How big is a 100mm grinder?
Just under four inches in diameter. It is a home grinder built for processing large amounts in one turn, not something you carry with you.

Shop All Herb Grinders

All 15 grinders are in the herb grinders collection, from $15, in 40mm, 50mm, 63mm and 100mm. Pair a fresh grind with a glass hand pipe, a clean bong bowl, or browse glass bongs for the piece itself. Free US shipping on orders over $75.