3M(TM) Diamond Hand Hones, HH2, 220/400, X=1/16, W=3/8, T=1/4, LI=1, L=4, 1 per case HH2 hand hones are fine grade diamond in a resin bond matrix mounted on both ends of an aluminum holder in a 220/400 mesh combination, hones are used for hand finishing and deburring of dies, hard steel, ceramics, composites and non-ferrous parts.