Shaft Collar, System of Measurement Metric, Bore Type Round, Bore Diameter 16 mm, Bore Thread Size Not Applicable, Collar Outside Diameter 28 mm, Inside Height to Flat Not Applicable, Clearance Diameter 28 mm, Collar Width 12 mm, Collar Material Stainless Steel, Keyway Width Not Applicable, Collar Material Grade 303, Keyway Depth Not Applicable, Collar Construction 1-Piece, Screw Material Stainless Steel, Screw Material Finish Bright, Resistance Properties