【HIGH POWER AND IMPACT RESISTANCE】Bolt nut remover processed from high hardness chrome molybdenum steel, Reverse spiral flutes are designed to bite down to provide maximum gripping power 【ACCURATE AND DIVERSE METRIC SIZES】16-piece sized bolt nut remover+1 hex adapter +1 Impact driver socket adapter. and sockets work on SAE/Metric sizes - 1/4”, 7mm, 5/16”(8mm), 9mm, 3/8”, 10mm, 7/16”(11mm), 12mm, 1/2”, 13mm, 14mm, 9/16”, 5/8”(16mm), 17mm, 11/16”, 3/4”(19mm), include the 3/8 "to 1/4"hex. Impact square drive all are 3/8" drive, for all kinds of job applications 【WIDE RANGE OF APPLICATION】The drive end has a hexagonal surface and can be used with flat wrenches, pliers, adjustable wrenches, sockets or VISE-GRIP locking pliers. 3/8 "impact rated square drive, can be used with pneumatic tools. In addition, it can also be converted by a hex adapter for use with impact drill 【EASY TO PICK UP AND CARRY】These broken bolt extractors have Black oxide surface provides greater strength and durability and prevents corrosion. each nut has engraved inch sizes, you can easily identify and select the most suitable size. The entire set is packed in a plastic box for easy storage 【PREMIUM SERVICE】If you have any problems during using our product. contact our Professional after-service team via email. TOPEC after-sale team will get in touch with you and timely solve your problems