A QUARTER TURN OPENS IT
One quarter turn opens the main compartment. Another locks it shut. Long threads are what cross and bind, and there are none here. It opens the same whether the chamber is empty or packed tight.
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A 4 piece grinder is only as good as the moment you try to open it.
Aluminum threads seize, the main compartment locks up, and you end up wrenching at a full grinder with both hands. The Premium 4 Piece EZ Grinder is 63mm of aircraft-grade aluminum built so that stops being a problem, $34.99 in seven colors.

One quarter turn opens the main compartment. Another locks it shut. Long threads are what cross and bind, and there are none here. It opens the same whether the chamber is empty or packed tight.
Thirty-three triangular teeth cut a consistent medium-to-fine grind. Triangular teeth bite into dense, sticky material and keep cutting. What comes out packs evenly instead of clumping in one spot.
Ground material drops through a removable micron mesh screen, and the finest powder collects in a separate chamber below. Let it build up over weeks and use it as a kief catcher, or treat it as a second compartment for keeping something apart on the move. Either way it is the reason to buy a 4 piece grinder with kief catcher rather than a plain two-piece. What each of the four pieces does is laid out in how to use a grinder.
All four pieces are cut deep, so this 4 piece herb grinder holds more between refills and works as short-term storage without a separate container.
The bottom piece is interchangeable with the ONGROK Storage Puck line, so the chamber holding your kief comes off and travels on its own instead of staying in the grinder.
At 63mm across it is still portable, and there is room to drop a small 2-way humidity pack into the bottom chamber if something is sitting for a while.
A guitar pick scoop for getting powder out of the catch chamber, and a cleaning brush for the screen. Both are in the box.
Black, Gold, Gun Metal, Green, Rose Gold, Orange and Blue. Premium quality, without the premium price tag.
Raise the handle on the screen and turn it counter-clockwise, and it comes free. Brush the chambers, wipe the teeth, and put it back. For a deeper clean the Accessory Cleaning Kit handles the residue that a brush leaves behind. The full routine, soak times included, is in how to clean a grinder.
The Mini 4 Piece EZ Grinder is the 2.2 inch version at $24.99, same opening, same catch chamber, smaller footprint. The rest of the range is in herb grinders.
DISCLAIMER: ONGROK products are not meant to be used for any illegal purpose. Any usage as such, is not the intended purpose of ONGROK LTD.
At ONGROK, our goal is to "ENHANCE YOUR EXPERIENCE", by bringing you the best products possible. If you're ever dissatisfied, just reach out and we'll be certain to make things right!
Picked to go with this one. Ships in the same order.