The Torque-Arm® II is a shaft mount helical gear reducer that mounts directly to the driven shaft with a number of accessories available to produce versatility, cost savings and long life. A long list of standard features makes this reducer suitable for a wide range of environments right off the shelf. Dodge® Torque-Arm® II Speed Reducer, Heavy-Duty, Series: TA Series, 15:1 Gear Ratio, Straight Bore Output, 3-7/16 in Output, 1791 RPM Input Maximum, 0.875 x 0.4375 x 8.96 in Keyway, 85 % Efficiency, Shaft Mounting, Cast Iron, Gray Painted, 8.97 in L Dimensions