The body and the blade is made of HSS (high-speed steel) through high speed steel grinding, cutting a smooth hole without burr, saving you a lot of time and effort. After a special heat treatment, the cutting edge is sharp and high strength. 3. High precision, smooth cutting, impact resistant, wear resistant. Excellent to cut ferrous metal, non-ferrous metal, can also process the stainless steel plate below 3mm. Allow you to cut on uneven artifacts, such as all kinds of openings in the pipeline.