Innovative Products of America's XL Bore Brushes are extra large brushes that come in either brass or stainless steel and in 25 mm, 30 mm, 35 mm and 40 mm diameter sizes. The overall length is 3.5”, including the 1/4” drive shank which allows for maximum versatility with many shop tools. The brushes are available individually or in a 4-piece set. They can be attached to a 1/4” driver or low-speed gun to remove debris from throttle bodies, brake calipers, engine components and much more.