Chicago Die Casting 3/4" Bore Die Cast Shaft Collar, with a 1-1/4" outer diameter and a slotted headless set screw, is ideal for holding bearings and sprockets to shafts. Shaft collars are used to hold bearings and sprockets to shafts and other components and can act as mechanical stops. A two-piece clamp collar wraps around a hard or soft shaft without marring. Set screw collars use a set screw to lock onto a soft or predrilled shaft. This shaft collar comes furnished with 1 slotted headless set screw.