This mixer attachment is a top-to-bottom mixing-flow paddle design. This paddle is ideal for paints, lacquers, thin coatings, and ready-mix plaster. The material flow when using this paddle will be top-to-bottom. This paddle uses a 5/16" hex shank connection. Best for mixing paints and lacquers Top to bottom flow 13.5" overall length 5/16" hex shank paddle connection