This oscillating 5 inch diameter accessory brush has a threaded 5/16×24 steel shaft to fit popular rotary polishing and DA machines including: PORTER-CABLE 7424XP, Meguiars G110v2 Polisher, Dynabrade 59040· Orbital Pneumatic-Random Orbit and similar electric and air operated dual action machines. Stiff nylon bristle drill brush fits DA polishers for heavy duty scrubbing. Works great on Brick, Stone, and Concrete. 5 inch red round stiff bristle flat scrub brush. Great for outdoor scrubbing requiring a stiffer bristle brush. Great for Driveway and stone patio Spot Cleaning.Cordless drill NOT included Drill NOT included