Package Details Introduce30pcs thread repair tool kit, all made according to professional standard, includes 1 twist drill bit, 1 break pin tool, 1 installation tool, 1 hex wrench, 1 cutting tap, 25 wire thread inserts, and a storage box, allow you to have a smooth repairing experience. Wide ApplicationThis thread repair kit is for 3816 inch to repair damaged or worn out threads, the drill bit is about 9.9 mm in diameter, this kit helps create a stronger internal thread in soft metals and protects tapped threads against wear and damage, ideal for engine repair and other automotive applications. Excellent MaterialThe thread repair tool kit made from precision stainless steel wire for strength, wearproof and durability which can increase connection strength and fatigue resistance, the handle is made of highquality rubber, ergonomically designed, nonslip and easy to grip, giving the hand a comfortable feeling. High Precision Intimate DesignTwist drill bits are used 135 top angle design with stronger metal penetration, HSS screw taps have precise screw threads, the drill bits quickly create room for the installation tools to smoothly fit the inserts that repair your old threading and the breaking tool. Quick Storage PortableThread repair tool kit with a storage box, each accessory has its place, for easy transport and storage between jobs, the twist drill bits and screw taps engraved with text marks to help you quickly organize and use, which is convenient for your work.