Easily remove stubborn screws with this 15piece screw extractor set , featuring a ranges of extractor and left hand drill bit Durability Left hand drill bit made with impact-resistant 6542 steel , screw extractor made with crmo steel , which increases durability and service life It ' s built to last and is designed to be hard , and easier to drill , greatly increasing service life Also , comes with a storage tool box to you will not lose any of more , you can take it with you Easy to Use Simple to remove all stuck screws or bolts in a few seconds Step 1 to choose a drill bit smaller than the damaged screw , Step two to use the same size extractor to take out reversely use your electric hand drills in low speed avoid getting hurt 15PCS Upgrades Screw Extractor Set Screw Extractor : 1 # , 1 # , 2 # , 2 # , 3 # , 4 # , 5 # Left Hand Cobalts Drill Bit : 1 / 8 " , 1 / 8 " , 5 / 32 " , 5 / 32 " , 3 / 16 " , 1 / 4 " , 19 / 64 " 1 / 4 " Adapter for electric drill-6cm Besides , there is 1 / 4 " adapter for electric drill-6cm to extend the drill interfaces Wide Applications Whether you need to remove rusted , stripped , or damaged bolts and Studs , or simply want to disassemble fasteners , this set is an excellent It includes both screw extractor and left-hand drill bit , making it easy to tackle even the toughest tasks, Manufacturer: Watreketal