1Come with thickening high carbon steel handle, with energy saving design of bending helve 2Adopt high temperature treatments for spear parts, sturdy, strong, durable and practical 3Handle using ergonomic design, comfortable and won't skid when operate even for a long time 4Provide manual rotation back device, help you to save time and effort, quick and convenient 5Rivet nut gun kit applicable tips for M3, M4, M5, M6, very practical and convenient to use Item Type: Rivet Nut Gun Kit Material: Carbon steel Model: BT-603 Maximum Effective Working Stroke: Approx. 6mm / 0.2in Maximum Force Arm Multiple: 25 Times Applicable Tips: M3 M4 M5 M6 How to Use:1. Choose a suitable mandrel for use and screw it to the front end 2. The wrench is stuck on the front shaft cap 3. Remove the nut 4. Press down the card position as if inward to complete Length: Approx. 210mm / 8.3in 1 x Rivet Nut Gun 4 x Mandrel(1 x M3, 1 x M4, 1 x M5, 1 x M6) 1 x Wrench 100 x Rivet Nuts(M3, M4, M5, M6, 25pcs of each) 4 x Shaft Cap(1 x M3, 1 x M4, 1 x M5, 1 x M6) 1 x User Manual