Shaft Collar System of Measurement Inch Bore Type Round Keyed Bore Diameter 1 1/4 in Bore Thread Size Not Applicable Collar Outside Diameter 2 1/16 in Inside Height to Flat Not Applicable Clearance Diameter 2.3 in Collar Width 1/2 in Collar Material Stainless Steel Keyway Width 1/4 in Collar Material Grade 303 Keyway Depth 1/8 in Thread Direction Not Applicable Center to Lever Top Not Applicable Collar Construction 2-Piece Screw Material Stainless Steel