Professional hammer free technology: Made of heat treated hardened steel, spring loaded design, it can provide 3500PSI impact without a hammer Safe and easy to use: no need to swing heavy or blunt objects, work in areas that cannot be reached by traditional hammers, perfect in narrow spaces, and will not damage the surface or decoration Widely used: nails and marks on the surface of wood, metal and glass. Use it as a screw hole driver and fix nails on small nails to make these tools necessary for any carpenter or finisher Two double head spring nails, hammer free nail kit and punching tool provide impact force. It is very suitable for small spaces. This precision CNC machining kit is made of heat treated hardened carbon steel with corrosion resistance and oxidation treatment. The hammer free action ensures precise control for excellent results. Excellent accuracy and control, while safe and easy to use. This versatile tool is designed to allow you to easily make perfectly centered, highly visible markers for drilling holes on any surface. The heavy load of this punch enables you to mark on the hard metal surface and even drive out rivets. Package includes: 2 spring tool pin sets and hinge pin sets Specification: Material: carbon steel Color: as shown in the figure Product length: 12.2 cm/4.80 inch, 13.5 cm/5.31 inch