10" commercial grade Flex-Hones Aluminum Oxide. Nikasil Applications Hones are made with a softer material, Aluminum Oxide. These special hones are required for today's coated aluminum cylinders. These aluminum oxide hones are recommended for nikasil and chrome coated cylinder bores. Sizes not listed we can order. Engine Cylinder Hones for deglazing engines and refinishing cylinder bore. Comes with 34" drive shaft.