1pcs 8.3mm twist drill , 1pcs M8x1.25 screw tap, 1pcs installation tool, 1pcs breaking pin tool, 1pcs mini hexagonal wrench, 25pcs M8 thread insert. Attention: Before you buy this kit, please make sure which size do you need. M8 thread inserts is made of stainless steel, installation tool and breaking pin tool surface electrophoresis treatment, sturdy, not easy to corrode. Twist drills and M8 screw taps are made of HSS (high speed steel), which has better wear resistance and heat resistance. There is a limit screw on thread insert installation spanner, which can control the push depth of thread inserts. 135° apex angle of twist drills, with stronger metal penetration and higher efficiency 1. Drill out the injured thread with the drill bit. 2. Check the thread and pitch of the tap and the bolt match. 3. Use the specific taps for cutting the holding thread into the cleared hole. 4. Place the insert on the installation tool and center the insert tang in the tang slot. Wind the insert in with gentle downward pressure until half rotation below the surface. 5. punch the punch with the hammer instantaneously to remove the tail The helicoil thread repair insert kit is suitable for all metals, composites, polymers, and other materials, and can be widely used in automotive and plumbing applications, such as restoration and replacement of stripped or internal screw threads, guaranteeing long-lasting results for the bolt, motor plug, and spark applications, it's an essential tool for any mechanic or DIY enthusiast, ideal for automotive and engine repairs Colour:As Shown Material:Metal Package Contents: 1 set * helicoil thread repair kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.