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Number of teeth : 18 Chain number : 120 Hub length : 3-1/2 in Bore type : Finished w/ Keyway & SS Hub diameter : 6-3/4 in Length between sprockets : 55/64 in Bore diameter : 3.4375 in Set screw type : One over Keyway Maximum rpm : 1500 RPM Coupling overall length : 7.8750 in Outside diameter : 10.0000 in Material : Steel Keyway size : 7/8 x 7/16 in