Drillbrush Construction Tools - Medium Scrub Brush - Threaded - 5/16 x 24 - fits Electric - Cordless - Air Pneumatic - Variable Speed - Dual Action - Orbital - Rotary - Buffer - Polisher &ndash; Machine Threaded Shaft 5/16x24 brushes to fit Polishers and DA machines Made to fit Electric and Air Pneumatic Dual Action Rotary Polishers and DA machines For use on fibreglass, tile, carpet mats, upholstery, and spot cleaning 5/16-24 Threaded Shaft also fits Cordless Battery Drill,machine not included Drillbrush Products have a 90 day no questions Money Back guarantee If not satisfied with brushes