Chicago Die Casting 3/8" Bore Die Cast Shaft Collar is for holding bearings and sprockets to shafts. With a 3/4" outer diameter and a slotted headless set screw, this shaft collar provides a secure and stable connection. The two-piece clamp collar wraps around a hard or soft shaft without marring, while the set screw locks onto a soft or predrilled shaft. This shaft collar is furnished with 1 slotted headless set screw each, making it easy to install and adjust.