COMPLETE SET Effortlessly restore stripped, damaged, and worn internal threads using this SAE helicoil thread repair tool kit. The set includes drill bits, screw taps, wire thread inserts, and installation tang breakoff tools in the 5 most needed SAE sizes 14, 516, 38, 716, and 12 WIDE APPLICATIONS Our universal rethreading tool kit engineered to effectively handle tasks across a variety of materials, including aluminum, iron, carbon steel, bronze, and magnesium. Our thread repair set is ideal for use in automotive and plumbing applications BUILT TO LAST The drill bit in this thread repair tool set is constructed from highspeed steel for superior handling with your drill, while each insert is made of 304 stainless steel for greater strength and endurance EFFICIENT OPERATION The 135 drill bits quickly create room for the installation tools to smoothly fit the inserts that repair your old threading, and the breakoff tools clean things up for use EASY ORGANIZATION These thread repair kit comes with a rugged blowmolded case to keep everything organized for easy storage or transportation between jobs