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 1.5 INSERTS P/N R1084-10-N (Pack of 12)
Lisle 20530 10Mm Spark Plug Adapter
Universal 10mm Spark Plug Gap Gapper Feeler Tool Sparkplug Gauge Caliper Engine
10mm Spark Plug Compression Tester Adapter Set for Accurate Diagnostics
