Double splite collars (SC2) allow installation without disassembling machinerySC2 collars provide superior grip actionFinish: Black Oxide Inside Diameter: 1 Inch Inside Diameter Maximum: 1.0040 Inch Inside Diameter Minimum: 1.0010 Inch Item: Shaft Collar Material: Low Carbon Steel Measurement: Inch Origin: Imported Outside Diameter: 1-3/4 Inch Outside Diameter Maximum: 1.7580 Inch Outside Diameter Minimum: 1.7420 Inch Set Screw Size: 1/4-28 Style: 2-Piece Thickness: 1/2 Inch Thickness Maximum: 0.5050 Inch Thickness Minimum: 0.4950 Inch Type: Round Bore