This stainless steel gasket scraper set is perfect for removing gasket residue, black carbon deposits, primer, and more. The folds should be sharpened in such a way that the scraper will not damage the metal surfaces of cylinder heads, water pumps, thermostat housings, etc. You can sharpen the folds yourself with a file. HBM scrapers are made of special alloy chiseled steel with a soft-grip, non-slip, impact-resistant handle. The scrapers have stainless steel blades and ergonomic handles.