3 through 72-inch sheave diameters.1/4 through 3 inch wire rope sizes*4 to 1 design factor**Plain bore (no bearings, bronze bushing, roller bearing without inner race, roller bearing with inner race, and tapered roller bearing types.Cast iron, ductile iron, cast steel and ForgeFab™ roll-forged steel plate material types.3/4 through 5-inch hub widths.(Standard; Larger sizes upon request)Flame hardened grooves to minimum Rockwell “C” 35 on all sheaves 16 inches and larger.** 4 to 1 design factor based on Working Load Limit of 6 x 25 filler wire Type W IWRC (Independent Wire Rope Core) IPS hoisting rope as it applies to the Maximum size listed under conditions of 180° wrap.