Features: Brand new and high quality High hardness, make drilling easier and faster. The stripped screw extractor set is included two extension bit holder. Can remove in step, do not need to conversion extractor or adjust the chuck. The stripped screw extractor kit is includes 20pieces of stripped screw extractor in 10 different sizes to satisfy all you demand. Suitable for any sizes screw or bolt. Suitable for allen bolts, machine screws, lag bolts, wood screws, sheet metal screws and other screws. The product needstobe installed in the socket adapter first, and then attach it to the extension bit holder, universal chuck that suitable for most electric hand drills. Specifications: Material:Stainless steel Weight:241g Conversion connecting rod:25mm/60mm Black Knurled Connecting Rod:60mm Packing size: 20x9x2.1cm/7.87x3.54x0.82inches Package Includes: 33x Damaged Screw Extractor note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.