Shaft Collar System of Measurement Inch Bore Type Threaded Bore Diameter 7/8 in Bore Thread Size 7/8 In.-9 Collar Outside Diameter 1 5/8 in Inside Height to Flat Not Applicable Clearance Diameter 1.92 in Collar Width 1/2 in Collar Material Stainless Steel Keyway Width Not Applicable Collar Material Grade 303 Keyway Depth Not Applicable Thread Direction Right Hand Thread Center to Lever Top Not Applicable Collar Construction 1-Piece Screw Material Stainless Steel