Double splite collars (SC2) allow installation without disassembling machinerySC2 collars provide superior grip actionFinish: Black Oxide Inside Diameter: 1-11/16 Inch Inside Diameter Maximum: 1.6935 Inch Inside Diameter Minimum: 1.6885 Inch Item: Shaft Collar Material: Low Carbon Steel Measurement: Inch Origin: Imported Outside Diameter: 2-3/4 Inch Outside Diameter Maximum: 2.7580 Inch Outside Diameter Minimum: 2.7420 Inch Set Screw Size: 5/16-24 Style: 2-Piece Thickness: 11/16 Inch Thickness Maximum: 0.6925 Inch Thickness Minimum: 0.6825 Inch Type: Round Bore