Fix-A-Thread Thread Repair Replacement Spark Plug Inserts - 12 x 1.25mm x 1/2in. - 28122

Fix-A-Thred is a simple, cost effective system for repairing damaged or worn threads, will also create stronger than original threads. Inserts and taps are interchangeable with all other Helical thread insert systems.
Inserts made from 18-8 stainless steel