This bung inserted mixer allows you to mount it directly to the side of a 55 gallon drum or any similar vessel. The folding props enter through the 2” bunghole and automatically open with centripetal force and provide mixing for low to medium viscosities. With heat treated aluminum housing you get both outstanding durability and lightweight portability. This mixer comes standard with a 5/8” diameter 316SS shaft and (3) 4" 304SS set screw attached impeller. Mixer Direct customization options include longer shafts, multiple gear ratios, and varied impellers to encompass any mixing need.