Shaft Collar, System of Measurement Inch, Bore Type Round, Bore Diameter 1/4 in, Bore Thread Size Not Applicable, Collar Outside Diameter 1/2 in, Inside Height to Flat Not Applicable, Clearance Diameter 0.5 in, Collar Width 5/16 in, Collar Material Carbon Steel, Keyway Width Not Applicable, Collar Material Grade 1211, Keyway Depth Not Applicable, Thread Direction Not Applicable, Center to Lever Top Not Applicable, Collar Construction 1-Piece, Screw Material Carbon Steel