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, 25:1 Gear Ratio, 10 HP, Solid Shaft Input, Straight Bore Output, 2-7/16 in Output, 80 RPM Output Maximum, 1996 RPM Input Maximum, 0.625 x 0.3125 x 7.58 in Keyway, 85 % Efficiency, Shaft Mounting, Cast Iron, Gray Painted, 7.59 in L Dimensions