Shaft Collar System of Measurement Metric Bore Type Round Bore Diameter 30 mm Bore Thread Size Not Applicable Collar Outside Diameter 50 mm Inside Height to Flat Not Applicable Clearance Diameter Not Applicable Collar Width 13 mm Collar Material Aluminum Keyway Width Not Applicable Collar Material Grade 6061 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top 25 mm Collar Construction 1-Piece Screw Material Stainless Steel Screw Material Finish Bright