MRV030 series worm gear speed reducer. This 20:1 ratio speed reducer is rated for 0.30 HP input at 1750 RPM on a hollow 5/8″ diameter x 1-7/8″ long keyed shaft and 56C mounting flange. Output is 159 lb/in on a hollow 5/8″ diameter x 2-1/2″ long keyed shaft. High quality reducer has an all aluminum heat sinking designed housing with epoxy coating. You can add a single output shaft (5/8″ x 1-1/2″ usable) for $19.99 or a double output shaft (2X 5/8″ x 1-1/2″ usable) for $24.99. Shipping weight: 5 lbs. 4-5-5 Powered by Solid Commerce The All-in-One Listing, Inventory & Order Management Solution for Online Merchants