Jeremywell 01102-075-4PC 4-Pcs Set Screw Shaft Collar, Zinc Plated Steel, 3/4" Bore Corrosion Resistant , .5625" width, .75 Carbon Steel (Pack of 4) Go to amazon.com Related posts Best shaft collar Feature3/4 inchLocking set screwPackage of 4 collarsZinc plated DescriptionPackage of four 3/4 inch zinc plated shaft collars. Collar has a set screw to lock the piece in place. Bore diameter is 3/4 inch inches