Repair your old damaged threads effortlessly with comprehensive thread repair tool kit. This all in one rethreading tool set consists of a total of 150 pieces, including drill bits, screw taps, threaded inserts, installation tools, and tang break-off tools, all in the 5 most needful SAE sizes: 1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, and 1/2 inch. Designed for versatility, this thread repair tool set handles various materials like aluminum, iron, carbon steel, bronze, and magnesium. This rethreading kit's 135° drill bit ensures easy use and precise drilling, creating room for installation tool to fit helicoil smoothly. Constructed from premium quality materials, including a HSS drill bit and 304 stainless steel inserts, this helicoil kit ensures lasting use. With the added convenience of a carry case for transport and organized storage, your threading concerns are met head-on. 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 break-off tools in the 5 most needed SAE sizes: 1/4", 5/16", 3/8", 7/16", and 1/2" 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 high-speed 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 break-off tools clean things up for use EASY ORGANIZATION: These thread repair kit comes with a rugged blow-molded case to keep everything organized for easy storage or transportation between jobs