Manual Coffee GrinderROK Coffee This manual coffee grinder by ROK is impeccably engineered, producing remarkably consistent grounds with the joy and reliability of a hands on manual grind. Made from a high strength, die cast aluminium alloy and glass composite, with hardened steel conical burrs 10 year warranty on metal parts, 2 year warranty on non metal parts. Spare parts can be purchased outside of warranty for a reasonable cost. Excellent grind control, adjustable