Feature:1. High Speed Steel Material: The installation tool in this spiral coil kit is made of high speed steel material, which provides excellent maneuverability2. 45# Steel Insertion Piece: The insertion piece is made of heat treated 45# steel material to improve strength and service life3. Protect From Wear: Drill tap kits are ideal for repairing spalled or damaged female threads and performing maintenance work to protect any threads from wear4. With Storage Box: Come with a convenient storage box, which can hold and organize all parts for easy transportation and storage between jobs5. Easy To Use: The drill bit quickly creates space for installation tools to smoothly install and repair the old threaded blade, interrupt the tool to clean things for use in the fieldSpecification:Item Type: Thread Repair KitMaterial: High speed steel + 45# steelSpecification: 75 Pcs/setTap: M5x0.8, M6x1.0, M8x1.25Purpose: Thread repair.Package List:60 x Spiral Coil3 x Installation Tool3 x Tap 3 x Twist Drill3 x Hex Wrench3 x Destruction Tool