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 demand Suitable for any sizes screw or bolt High hardness, make drilling easier and faster The product needstobe installed in the socket adapter first, and then attach it to the extension bit holder, chuck that suitable for most electric hand drills Suitable for allen bolts, machine screws, lag bolts, wood screws, sheet metal screws and other screws, Manufacturer: Msioytog