Shaft Collar, System of Measurement Inch, Shaft Locking Type - Couplings 2 Piece Clamp, Bore Type - Collars Plain Bore, Bore Dia. 13/16 in, Material - Collars Steel, Outside Dia. 1 3/4 in, Width 1/2 in, Clearance Dia. 1.75 in, Screw Size 1/4 In. -28 x 5/8 in, Screw Material Steel, Operating Temp. Range 0 Degrees to 300 Degrees F