Shaft Collar, System of Measurement Inch, Bore Type Round, Bore Diameter 3 in, Bore Thread Size Not Applicable, Collar Outside Diameter 4 3/4 in, Inside Height to Flat Not Applicable, Clearance Diameter Not Applicable, Collar Width 3/4 in, Collar Material Aluminum, Keyway Width Not Applicable, Collar Material Grade 6061, Keyway Depth Not Applicable, Thread Direction Not Applicable, Center to Lever Top 2.38 in, Collar Construction 1-Piece, Screw Material Stainless Steel