Housed in glass-reinforced nylon, gear drives come in standard Model RAB and miniature Model MAD. Measuring 3 21/32 x 3 5/16 x 1 1/4 in., Model RAB employs shielded, lubricated, hardened-steel ball bearings and gears and is rated 1/3 hp, 1,600 rpm with top speed of 3,000 rpm. Measuring 1.25 x 1.25 in., Model MAD uses permanently lubricated gear drives, hardened-steel helical gears, and nonmetallic bearings. It is rated 1,800 rpm maximum and 1/8 hp continuous.