What You Get: The 15pcs screw extractor set includes 7pcs spiral screw extractors, 7pcs HSS steel cobalt left-handed drill bits and a 1/4'' quick change adapter. These are all stored in a sturdy box, so you can find them easily Multiple Sizes: The spiral screw extractor kit sizes: 1#, 1#, 2#, 2#, 3#, 4#, 5#. The left-hand drill bit set sizes: 1/8", 1/8", 5/32", 5/32", 3/16", 1/4", 19/64". The base of the screw extractors and drill bits are designed to fit the 1/4'' standard size, making them compatible with any power tool or hand tool equipped with a 1/4” adapter Quality Materials: The screw extractors are crafted from high-quality heat-treated CR-MO steel, ensuring durability and strength. The left-hand drill bits are made of high-speed steel (HSS) and finished with Titanium plating, enhancing their durability and resistance to wear and tear Easy Out Screw Extractor Set: The set features a unique 135° head design on the drill bits, making it easier to drill through various materials such as boards, bricks, cement, and ceramic tiles. The spiral design of the screw extractors provides excellent grip, facilitating the removal of rusted, frozen, or damaged screws, bolts, and studs Instructions for Use: Start by choosing a drill bit smaller than the broken screw and drill out a hole in the center. Next, insert the appropriate size extractor into the hole and gently hammer it into the desired depth. Finally, use a wrench to turn the extractor out, effortlessly extracting the damaged screw PRIDE&CRAFT 15Pcs Screw Extractor Set, Easy Out Bolt Extractor and HSS Steel Cobalt Left Hand Drill Bit Kit, Stripped Screw Extractor with 1/4'' Adapter for Broken Bolts, Screws and Studs