This gearbox features a 1:1.47 Speed Up gear ratio for use on 5' and larger diameter rotary cutters. Industry standard 1-3/8" Diameter X 6 Splined input shaft and 1.57" diameter 12 tapered spline output shaft allow fitment to most light, standard and medium duty rotary cutters. Each gearbox features high speed ball bearing units and heat treated gears and shafts to ensure long life. Four bolt mounting matches industry standards. Each gearbox includes blade carrier mounting nut and cotter pin. Gearboxes are shipped dry and require 16 ounces of 80-90W gearlube or equivalent. Disclaimer: Any and all Original Equipment Manufacturer's (OEM) tradenames, trademarks, drawings, colors, descriptive information and part numbers are used for parts identification purposes only, and DN Equipment, LLC (DN) is in no way implying that any specific parts are OEM parts. Further, any use of the OEM's tradenames, trademarks, drawings or part numbers by DN is designed only to aid DN's customers, in obtaining the proper DN part or component which will replace the OEM's part.