Zero-Max Crown right-angle gear drives with AGMA Class 10 spiral bevel gears and non-magnetic stainless steel shafts have precision hardened and ground ball bearings for speeds to 2,000 rpm. The internal gears are permanently mounted to the shafts with locking pins. Standard two- and three-way models have 1:1 and 2:1 speed ratios in shaft diameter combinations of 3/8, ½, 5/8 and ¾ in.