GREAT ELASTIC OFFERS BETTER PERFORMANCE:Because of a certain elasticity, thread insert can even the load distribution on each thread, eliminate pitch and tooth deviation between screw and screw hole, and absorb vibration, thus increasing the screw thread connection strength and fatigue resistance STRENGTHEN CONNECTION: These steel thread inserts used in low strength materials such as aluminum, magnesium, can avoid thread damage and get a good connection performance, to enhance connection strength and improve connection condition EASY TO OPERATE AND MAINTENANCE: These Helical Type Thread Repair Inserts are easy to maintenance, install a thread insert into a damage screw hole, then the screw hole can be used as normal, in order to avoid work-piece loss GREAT TOOL FOR YOU: These Helical Coil Wire Thread Inserts are used for parts that requires frequent removing, it can greatly improve service life and wear-resistance of screw thread ANTI-LOOSE INSERTS: It can prevent screw from getting loose,especially used for products requiring high coefficient of insurance Colour:silver Material:Stainless steel Package Contents: 400 x heli coil 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.