UTMALL Engine Cylinder Hone Deglazer 2 inches to 6-1/2 inches Adjustable 4 inches Blade with 220 Grit Stones Piston Cylinder Hone. It use for deglazing engine cylinders 2 inches to 6-1/2inches in diameter, with 3 pieces adjustable 4” stones. and fit for engine cylinders of automotive, motorcycle and industrial equipment. Knurled wheel adjusts spring pressure of stones against cylinder bore, and fasten the screw down can add more spring pressure, turn the opposite to reduce tension. Constructed of premium steel and provide this Piston Honing Tool a good strength and durability, and the 220 grit stones are replaceable , easy to use and convenient to change the stone.