Shaft Collar, System of Measurement Metric, Bore Type Round, Bore Diameter 25 mm, Bore Thread Size Not Applicable, Collar Outside Diameter 45 mm, Inside Height to Flat Not Applicable, Clearance Diameter 52.1 mm, Collar Width 15 mm, Collar Material Carbon Steel, Keyway Width Not Applicable, Collar Material Grade 1215, Keyway Depth Not Applicable, Thread Direction Not Applicable, Center to Lever Top Not Applicable, Collar Construction 2-Piece, Screw Material Alloy Steel