Chicago Die Casting 1" Bore Die Cast Shaft Collar is ideal for holding bearings and sprockets to shafts. It has a 1-5/8" outer diameter and a slotted headless set screw. This shaft collar is made in the United States of America. 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 is furnished with 1 slotted headless set screw each.