Shaft Collar, System of Measurement Inch, Bore Type Round, Bore Diameter 1/4 in, Bore Thread Size Not Applicable, Collar Outside Diameter 5/8 in, Inside Height to Flat Not Applicable, Clearance Diameter 0.7 in, Collar Width 5/16 in, Collar Material Plastic, Keyway Width Not Applicable, Collar Material Grade Acetal, Keyway Depth Not Applicable, Thread Direction Not Applicable, Center to Lever Top Not Applicable, Collar Construction 2-Piece, Screw Material Stainless Steel