Flange Coupling Kit, For Worm Center Distance 2.06 in, Motor Frame Designation 56C, Motor Coupling Bore Diameter 5/8 in, Motor Coupling Keyway Depth 3/32 in, Motor Coupling Keyway Width 3/16 in, Reducer Coupling Bore Diameter 5/8 in, Reducer Coupling Keyway Depth 3/32 in, Reducer Coupling Keyway Width 3/16 in, Flex Coupling Material Cast Iron, For Use With 56C NEMA Frame Motor, Dayton Indirect Drive Right Angle Speed Reducer, Worm Center Distance 2.06 WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)