Shaft Collar, System of Measurement Metric with Inch Bore, Bore Type Round, Bore Diameter 1/4 in, 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