Features:The screw extractor kit is for tools that require the removal of screws, including bolts. Suitable for the most common drill bits and screws or bolts of any size.Easy to use, using a drill for head to drill a deep hole in the for head of the screw. And then select the corresponding screw extractor to insert it, and turn it counterclockwise with a hinge bracket or adjustable wrench.It was made of high-strength chrome-vanadium steel, very durable, reusable, longer life, high efficiency and durable and stable.Portable size, you can carry it anywhere. Great for carpenters, handymen, do-it-yourselfers, etc.The stripping screw extractor kit includes 1/8(3-6mm), 3/16(6-8mm), 15/64(8-11mm), 5/16(11-14mm), 3/8(14-18mm). Specifications:Material:Chromium Vanadium SteelColor:SilverSize:1/8(3-6mm)3/16(6-8mm)15/64(8 -11mm), 5/16(11-14mm), 3/8(14-18mm) Note:Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package includes:5 Pieces Fluted Screw Extractors/Set