Features: Steel inserts used in low tensile materials such as aluminum, magnesium, one can avoid damaging the wires and get good performance connection, connection to improve the resistance and improve the condition of the connection. Used for parts that require frequent removal, it can greatly improve the life and wear of the screws. Due to a certain elasticity, thread insert can even distribution the load on each thread, eliminate the pitch and tooth deviation between screw hole and screw, and absorb vibrations, thus increasing the connecting screw and the resistance to tiredness. It can prevent screws from being loose, especially used for products requiring high coefficient of insurance. Easy maintenance, install a wire damage insert it into a screw hole, then the screw hole can be used as normal, to avoid raw loss. Specification: Material: 304 stainless steel Size (inner diameter * installed length * installed pitch) and quantity : M3*0.5*1.5d (20pcs) M4*0.7*1.5d (20pcs) M5*0.8*1.5d (20pcs) M6*1*1.5d (10pcs) M8*1, 25*1.5d (5pcs) M3*0.5d*3d (20pcs) M4*0.7*3d (20pcs) M5*0.8*3d (20pcs) M6*1*3d (10pcs) M8*1.25*3d (5pcs) Weight: 110g/4oz (Approx.) Package List: 150* Threaded Inserts Note: installed Length=#d means number x diameter, for example, M3*0.5*1.5da installed Length = 1.5 d = 1.5 x 3 = 4.5 mm.