High Power and Tight Grip: The unique plum-shaped internal thread design provides excellent torque and can be used to rotate fasteners with deep bolts. The uneven concave inner wall helps hold the stubborn nut, the more you twist, the tighter the grip, the more it will not break or slide easily Complete size and easy to carry: Complete sizes include SAE (inch) and metric (mm): 8mm, 3/8", 10mm, 11mm, 12mm, 13mm, 14mm, 16mm, 17mm, 11/40 19mm, with 3/8" to 1/4" hex adapter Comes with a nice gift box, easy to carry, you can take it to any workplace Multi-function and wide application: have- Have you ever been bothered by the fact that abandoned vehicles cannot be modified? Have deeply corroded bolts bothered you in water pipe repair work? damaged, dead, rusty, rounded screws Surface painting process: The surface of each nut extractor is oxidized black and coated with anti-rust oil. Compared with other extractors, this more complex process can make our nut extractors more wear-resistant, and not so easy to rust after a long time of use