Shaft Collar, System of Measurement Metric, Bore Type Round, Bore Diameter 45 mm, Bore Thread Size Not Applicable, Collar Outside Diameter 73 mm, Inside Height to Flat Not Applicable, Clearance Diameter 80.1 mm, Collar Width 19 mm, Collar Material Aluminum, Keyway Width Not Applicable, Collar Material Grade 2024, Keyway Depth Not Applicable, Thread Direction Not Applicable, Center to Lever Top Not Applicable, Collar Construction 2-Piece, Screw Material Stainless Steel