FIX-A-THRED 38129 Metric Thread Individual Spark Plug Repair Kit

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