Use a brake honing tool to remove carbon, rust and thermal glaze deposits from the caliper and piston cylinder walls; pair with a power drill, lubricate with brake fluid and move up and down both sides of the engine cylinder at low speed Flexible shaft and spread control tension nut allow for faster cutting and maneuverability; 3 carbide are designed to be self-centered for quick insertion; Stone sleeves add strength and protect the stone when not in use [More Cylinder Styles]: Small Engine Honing Tool 220 medium grit ; square ends of make this Brake honing tool Perfect for step cuts and blind end cylinders [Adjustment Range]: Controls the range and pressure applied to the cylinder for a smoother, cleaner surface; Spring knurled adjustment nut increases tension and locks brake caliper honed metal arms in place; For use with diameters 3/4 to 1- 1/2 inch (1.9 to 6.4 cm) cylinder TYPE: 1-1/8inch(19-64mm) 3-jaw cylinder bore grinding tool Material: Metal colour: Silver Package Contents: 1 x Engine Cylinder Hone Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.