50pcs M4 x 0.7 x 1D Wire Thread Insert Screw Sleeve Assortment Kit,304 Stainless Steel Metric Helicoil Type Thread Repair Insert Conversion

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• ✔️Long：2.18~4mm
• ✔️Thread Pitch：0.7mm
• ✔️Inside Diameter：4mm
• ✔️External Diameter：5.6mm
• ✔️Material：304 Stainless Steel
• 【Premium Quality 】 Used in various low strength materials, which can improve the wear resistance of bolt connections and avoid the damage of thread. The locking type wire screw sleeve can lock the screw into the threaded hole, so that the screw is not loose when subjected to shock vibration, which is better than the normal locking device.
• 【Effect】 Because of a certain elastic, can make the load on the thread is more even, eliminate the screw and screw hole deviation between the pitch and tooth type, and can absorb vibration, thus increasing the screw thread connection strength and resistance to fatigue strength.
• 【Easy to maintain】 The damaged screw holes shall be put into the wire screw sleeve , which can be used again to avoid the possibility of damage to the workpiece.
• 【Special】 Wear resistant. Used for frequent disassembly, it can greatly improve the life of thread. Anti-loose. Especially for the aircraft and other products requiring high insurance coefficients.