They are a new type of fastener that increases the strength of the thread. Self-tapping inserts are embedded in softer materials such as plastics, aluminum alloys, cast iron and coppers to create stronger internal threads.
eBay
131 Pc Thread Repair Kit Helicoil Type - M5, M6, M8, M10 & M12. M8 x 1.25 x 10.8mm. M12 x 1.75 x 16.3mm. M10 x 1.5 x 13.5mm. 131pc thread repair kit including wire thread insert sizes M5. M6 x 1.0 x 8.0mm.
eBay
25pcs x Wire Thread Inserts M8 x 1.25 x 10.8mm. 10pcs x Wire Thread Inserts M12 x 1.75 x 16.3mm. 25pcs x Wire Thread Inserts M10 x 1.5 x 13.5mm. 25pcs x Wire Thread Inserts M6 x 1.0 x 8.0mm. 25pcs x Wire Thread Inserts M5 x 0.8 x 6.7mm.
eBay
10PCS x Wire Thread Inserts M12 x 1.75 x 16.3mm. 5PCS x Twist Drill Bits. 25PCS x Wire Thread Inserts M5 x 0.8 x 6.7mm. Includes 110 wire thread inserts. 25PCS x Wire Thread Inserts M6 x 1.0 x 8.0mm. 25PCS x Wire Thread Inserts M8 x 1.25 x 10.8mm.
eBay
Thread size: M12 x 1.75mm. Thread tap. Thread inserts. Insert installation. Tools > Other. Set includes These countries include, but aren't exclusive to, Switzerland, Norway, Malta, Canary Islands and the Greek Islands.
eBay
GENUINE RECOIL,,,,,,, MADE IN AUSTRALIA ,,,,,,,NOT CHINA COPY,,,,,,,,, 304,,,,STAINLESS STEEL RECOIL/HELICOIL INSERT ,,,, EXTRA LONG 3X LONGER THAN NORMAL,,,,,,,MORE TORQUE CAN BE APPLIED ,,,,,,,,,,,,,,,, PROBABLY STRONGER THAN ORIGINAL THREAD ,,,.
eBay
M6 x 1.0 Thread Repair Tool Helicoil Wire Insert Set 25pcs. Thread size: M6 X 1.0mm. Thread tap and the drill material: HSS (High-speed Steel). To repair a spark plug thread no Pre-drilling is necessary if using the special Spark Plug Tap.
eBay
Helicoil Wire Thread Repair Inserts. Material Quality: Made from A2 Stainless Steel (DIN 8140), known for its excellent strength and corrosion resistance. Why Choose Our Helicoil Inserts?. Ensure your threaded components remain in top condition with our Helicoil Wire Thread Repair Inserts.
eBay