... .2. drill steel, drill tool are tempering, forging, extrusion Etc, eating.3. diamond saw blades, rill tool’s welding4. drill bit, coal ... drill bit, pick bit’s welding5. braze lathe tool, milling cutter and all ... .3. hardening the industrial of machine tool, such as : bed guide way of machine tool.4. heat treatment pliers, spanner, screwdriver ...