This is the Santa Cruz Shredder made for grinding big batches: the same patented grind in a wide 70 mm body, with a deep storage chamber and the extra grip and turning force that make tough, sticky material easy to grind. One reviewer has run this size daily for nine years with the teeth still sharp, which is the kind of lifespan you are paying for at this price.

Flat-topped teeth cut the herb in several directions rather than crushing it, so what lands in the storage chamber is fluffy and even, the consistency that gives the best extraction in a vaporizer chamber. The 70 mm body exists so that a single turn of the lid grinds enough for several sessions, and the wide diameter gives your fingers real leverage to do it.

Under the storage chamber, a tightly woven T304 stainless steel screen passes fine pollen into the bottom compartment. The tighter weave collects genuinely fine material instead of allowing partly ground dust to pass through, over several weeks it accumulates into a potent reserve, and you can remove every last bit with the triangular scraper kept in the bottom chamber.

The construction matches the rest of the family: medical-grade, ultrasonically cleansed anodised aluminium machined in Santa Cruz, California, a rare earth magnet in the lid, and threading with a friction ring that always turns smoothly and never sticks. The knurling is deep enough that you can turn the grinder with your fingertips even when the chamber is packed completely full, and owners report it still turns smoothly when most grinders would already need cleaning.

If you carry your grinder in a pocket every day, the 4-piece Grinder (54mm) is the handier size. If you want this 70 mm diameter without the pollen chambers, the 2-piece Grinder (70mm) has only the grinding section. Both are sold separately.

Includes:

• Santa Cruz Shredder 4-piece grinder, 70 mm (1)