2 packs of 6! 10mm x 1. 1/2" reach (~13mm) These are NOS heli coil inserts for repairing stripped plug threads. Made in USA. These are inserts only, you'll need a heli coil tap and install tool. R13
12x Helicoil 14mm Spark Plug Thread Repair Inserts #R513 14- 1.25mm Reach 7/16"
12x Helicoil 14mm Spark Plug Thread Repair Inserts #R512 14- 1.25mm 3/8" Reach
Helicoil 10mm Spark Plug Thread Repair Kit Size 10-1.0mm PN 5523-10
Lisle 20530 10Mm Spark Plug Adapter
10mm Spark Plug Compression Tester Adapter Set for Accurate Diagnostics
Lisle 20530 Compression Tester Adapter, For 10mm Spark Plug Threads
