【Reverse Spiral Clamping & Gripping】The internal reverse spiral design of the extractor delivers outstanding torque , making it easy to out damaged bolts and nuts . It works with various tools such as impact wrenches , manual and pneumatic ratchets , hex wrenches , flat wrenches , adjustable wrenches , pliers and sockets 【Precision Production Technology】The bolt and nut remover is made of chrome molybdenum steel . Each extractor is precisely CNC machined to meet or exceed ANSI performance standards , with a black oxide coating and 60HRC hardness , providing excellent impact resistance , endurance and service life 【Convenient Storage】All bolt and nut removers are placed in a storage case for easy access at any time 【Various Sizes and Wide Applications】The nut extractor socket set comes in 8 different sizes including 14mm , 16mm , 17mm , 19mm , 21mm , 22mm , 24mm , 27mm plus an extra metal rod . It meets various daily needs and offers great convenience for auto repair , home decoration and craft production 【Simple to Operate】Just use a hammer to tap the removal tool onto the damaged nut , then select a 1/2 inch square drive wrench to loosen the nut counterclockwise for removing rusty nuts easily, Manufacturer: PATNFR