1F578-A Shaft Collar, System of Measurement Inch, Bore Type Round, Bore Diameter 1 1/8 in, Bore Thread Size Not Applicable, Collar Outside Diameter 1 7/8 in, Inside Height to Flat Not Applicable, Clearance Diameter 2.19 in, Collar Width 1/2 in, Collar Material Plastic, Keyway Width Not Applicable, Collar Material Grade Acetal, Keyway Depth Not Applicable, Thread Direction Not Applicable, Center to Lever Top Not Applicable, Collar Construction 2-Piece, Screw Material Stainless Steel ✅ Shaft Collar, Clamp, 2Pc, 1-1/8 In, Plastic ✅ Item: Shaft Collar ✅ Material: Plastic ✅ Bore Dia.: 1 1/8 in ✅ Screw Thread Size: 1/4 -28 Manufacturer MOLLIFII