Shaft Collar, System of Measurement Inch, Bore Type Round, Bore Diameter 2 1/2 in, Bore Thread Size Not Applicable, Collar Outside Diameter 3 3/4 in, Inside Height to Flat Not Applicable, Clearance Diameter 3.82 in, Collar Width 7/8 in, Collar Material Carbon Steel, Keyway Width Not Applicable, Collar Material Grade 1045, Keyway Depth Not Applicable, Thread Direction Not Applicable, Center to Lever Top Not Applicable, Collar Construction 1-Piece, Collar Material Finish Black Oxide