Features Improved connection strength-Steel thread inserts for low-strength materials such as aluminum and magnesium can prevent thread damage and achieve good connection performance. Extended service life-Used for parts that need to be disassembled frequently, which can greatly increase the service life and the wear resistance of the thread. Fatigue resistance-Due to its elasticity, the thread insert can evenly distribute the load on each thread, eliminate the pitch and tooth deviation between the screw and the screw hole, and absorb the vibration Safe and reliable-Thread repair insert prevents screws from loosening, especially for products that require a high insurance factor. Easy to maintain-Insert the thread into a damaged screw hole, and then use the screw hole normally to avoid losing the workpiece.​ Description: Steel threaded inserts can effectively improve screw connections and greatly improve reliability. Thread inserts are used in various low-strength materials, which can greatly improve the wear resistance of screw connections and avoid thread damage. Feature: Improved connection strength-Steel thread inserts for low-strength materials such as aluminum and magnesium can prevent thread damage and achieve good connection performance. Extended service life-Used for parts that need to be disassembled frequently, which can greatly increase the service life and the wear resistance of the thread. Fatigue resistance-Due to its elasticity, the thread insert can evenly distribute the load on each thread, eliminate the pitch and tooth deviation between the screw and the screw hole, and absorb the vibration Safe and reliable-Thread repair insert prevents screws from loosening, especially for products that require a high insurance factor. Easy to maintain-Insert the thread into a damaged screw hole, and then use the screw hole normally to avoid losing the workpiece. Specifications: Material: Stainless steel Size: M4(inner diameter) x 2D(installed length=2*4mm=8mm) Quantity: 50pcs Weight: 89g(approx.) Package Includes: 50 x Threaded Inserts 1 x Installation Tool (M4) 1 x Dedicated Tap (ST4) 1 x Tang Breaker 1 x Drill Bit Package List