Aftermarket 20:1 56C Lexar MRV050 Worm Gear Speed Reducer Replacement Part Number: MRV050 Specification:This 20:1 ratio speed reducer is rated for 1.14 HP input at 1750 RPM on a hollow 5/8" diameter x 1-7/8" long keyed shaft and 56C mounting flange.Output is 646 lb/in on a hollow 1" diameter x 3-5/8" long keyed shaft.Parameter:Ratio: 20:1 Input Shaft Diameter: 5/8"Output Shaft Diameter: 1"Mounting: 56C Flange Rated HP: 1.14