Capabilities.2 pcs. Including 5/16 rotary spot welder and 3/8 rotary spot welding machine, which can meet your different needs. Double-sided. The double-sided rotating cutting blade separates the welded panel more effectively than the panel knife. When one side becomes blunt, just turn the cutting head on its branch assembly. There is a spring-loaded pin in the center of the blade that guides the knife through spot welding to drilling and spot welding so that a very clean hole can be left without distorting the sheet metal. High quality. Made of high-quality HSS material, with high hardness, not easy to deform, having a long service life. Scope. High working efficiency, suitable for stainless steel thin plate, cast iron plate, aluminum plate, F.R.P or other thin metal plates. Specifications. Material: HSS. Item color: silver. Size: 7.7 * 1 * 1cm / 3.03 * 0.39 * 0.39in (L * W * H). Weight: 80g / 2.82oz.