Shaft Collar, System of Measurement Metric, Shaft Locking Type - Couplings 2 Piece Clamp, Bore Type - Collars Plain Bore, Bore Dia. 34 mm, Material - Collars Black Oxide 1215 Lead Free Steel, Outside Dia. 57 mm, Width 15 mm, Clearance Dia. 62.4 mm, Screw Size M6 x 18, Screw Material Alloy Steel, Operating Temp. Range -40 Degrees to 350 Degrees F