Shaft Collar, System of Measurement Inch, Shaft Locking Type - Couplings 1 Piece Quick Clamp, Bore Type - Collars Plain Bore, Bore Dia. 3 in, Material - Collars Black Anodized 6061 Aluminum, Outside Dia. 4 47/64 in, Width 187/250 in, Clearance Dia. 4.724 in, Screw Size M6, Screw Material 18-8 300 Series Stainless Steel, Operating Temp. Range -40 Degrees to 200 Degrees F