Shaft Collar System of Measurement Inch Bore Type Round Bore Diameter 1 1/16 in Bore Thread Size Not Applicable Collar Outside Diameter 1 7/8 in Inside Height to Flat Not Applicable Clearance Diameter 2.14 in Collar Width 1/2 in Collar Material Aluminum Keyway Width Not Applicable Collar Material Grade 2024 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top Not Applicable Collar Construction 2-Piece Screw Material Alloy Steel