Use the ABN | small brake cylinder hone tool to easily remove corrosion and heat glaze deposits from your brake cylinders. Constructed of premium metal materials and 3 carbide stones, these automotive cylinder hones are designed for maximum strength and durability. 2-inch rigid honing stones feature a 220 medium grit to easily polish away glaze build up while the spring tension adjusting nut allows you to extend the metal arms to fit 1-1/4 to 3-1/2-inch inner diameter cylinders. The flexible shaft self-centers the piston brake honing tool for increased speed and maneuvering. Compatible with your drills, simply lubricate with brake fluid and run at low speeds moving up and down the cylinder walls. 9-inch brake cylinder honing tool fits compact car and small engine cylinders.