[Material]: High-Speed Steel 4241[Size]:Dr01,Dr02,Dr03,Dr04,Dr05,Dr06,Dr07,Dr08,Dr09,Dr10Ex01,Ex02,Ex03,Ex04,Ex05,Ex06,Ex07,Ex08,Ex09,Ex10 [Package List]:20 * Damaged Screw Extractor(Ex 1 - 10, Dr 1 - 10)1 * Magnetic Extension Bit Holder1 * Socket Adapter[Features]:1. High hardness, make drilling easier and faster.2. The stripped screw extractor set is included two extension bit holder. Can remove in one step, do not need to conversion the extractor or adjust the chuck.3. The stripped screw extractor kit is includes 20 pieces of stripped screw extractor in 10 different sizes to satisfy all you demand. Suitable for any sizes screw or bolt.4. Suitable for allen bolts, machine screws, lag bolts, wood screws, hex bolts, sheet metal screws and other screws.5. The size of 1- 10 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.