Helicoil Thread Repair Kit 320-Piece SAE and Metric Rethreading Tool Kit 34760886Specification: This kit ideal fit for repairing internal threads in automotive engines, spark plugs, bearings, and metal holes. This kit effectively restores threads on materials like aluminum, iron, carbon steel, bronze, and more Features: 1. The helicoil thread repair tool kit boasts a robust 320 piece collection, housing drill bits, screw taps, wire thread inserts, and more. It's meticulously designed fit for both metric and SAE sizes: 1 4", 5 16",