Check the listing for details. DAYTON 6L018 Rigid Shaft Coupling,Set Screw,2" L 6L018. Condition: New. Listed at 17.87 USD. Rigid Shaft Coupling, Bore Diameter 1 7/8 in, Bore Diameter 2 7/8 in, Bore Type Round Keyed, Clearance Diameter 1.75 in, Coupling Construction One-Piece, Coupling Material Carbon Steel, Coupling Outside Diameter 1 3/4 in, Different Bore Sizes No, Keyway Depth 1 3/32 in, Keyway Depth 2 3/32 in, Minimum Bore Diameter Not Applicable, Keyway Width 1 3/16 in, Keyway Width 2 3/16 in, Maximum Bore Diameter Not Applicable, Maximum Speed 1,800 RPM, Maximum Torque 660 in-lb, Overall Length 2 in Designed for applications in which alignment is critical, this one-piece, set-screw type, rigid shaft coupling helps reduce the possibility of backlash. It locks onto the shaft by tightening alloy cup point socket set screws. It features zinc-plated steel construction to help resist corrosion in demanding ind.