The Lisle 5/8" and 1-1/4" Carbide Scraper Set, No. 81800, is designed to remove gasket residue from steel and aluminum heads and manifolds, along with carbon buildup and rust. The Tungsten carbide tips are attached to the steel blade that is molded into the 6" long handle. Two blade widths, 1-1/4" (No. 81600) and 5/8" (No. 81700) work on many applications, and the tips remain sharp and are precision ground.