Features Used for parts that require frequent removal, it can greatly improve the service life and wear resistance of the thread. Easy to maintain, install a thread insert into a damaged screw hole, then the screw hole can be used normally to prevent loss of the workpiece. Steel thread inserts used in low-strength materials such as aluminum, magnesium, can prevent thread damage and get good connection performance, so as to improve the strength of the connection and improve the condition of the connection. It can prevent the screw from loosening, especially used for products that require a high insurance coefficient. Due to a certain elasticity, the thread insert can even out the load distribution on each thread, eliminate the pitch and deflection of the tooth between the screw and the screw hole, and absorb vibration, thereby increasing the connection strength of the screw thread and fatigue resistance. Steel thread inserts can improve the screw connection, greatly improving reliability. Used in all kinds of low-strength materials, thread inserts can greatly improve the wear resistance performance of the screw connection, and prevent the thread damage. Specification: Material: 304 stainless steel Size (inner diameter*step installed*length installed) Quantity (optional): M 4*0.7*1 depth, 100 pieces; M 4*0.7*1.5D, 100pcs; M 4*0.7*2 D, 100pcs; M 4*0.7*2.5D, 100pcs; M 4*0.7*3 D, 100pcs; Weight: 14g~40g/0.5oz~1.4oz (approx.) Package List: 1 Set * Threaded Inserts Note: Installed length = #D means # x diameter, for example, M 4*0.7*1 D has installed length = 1D = 1 x 4 = 4mm. Package List