Shaft Collar, System of Measurement Metric, Bore Type Round, Bore Diameter 12 mm, Bore Thread Size Not Applicable, Collar Outside Diameter 25 mm, Inside Height to Flat Not Applicable, Clearance Diameter 27.3 mm, Collar Width 6 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 1-Piece, Screw Material Alloy Steel