Shaft Collar System of Measurement Inch Bore Type Round Bore Diameter 1 13/16 in Bore Thread Size Not Applicable Collar Outside Diameter 2 7/8 in Inside Height to Flat Not Applicable Clearance Diameter 3.16 in Collar Width 11/16 in Collar Material Stainless Steel Keyway Width Not Applicable Collar Material Grade 303 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top Not Applicable Collar Construction 1-Piece Screw Material Stainless Steel