Shaft Collar, System of Measurement Inch, Bore Type Round, Bore Diameter 3 3/16 in, Bore Thread Size Not Applicable, Collar Outside Diameter 4 1/2 in, Inside Height to Flat Not Applicable, Clearance Diameter 4.75 in, Collar Width 7/8 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