Grip-Tite Super Sockets, from BT & F, remove rusted, damaged and severely rounded nuts and bolts with ease. These sockets hold and capture nuts and bolts in hard-to-reach places - no more banged knuckles or dropped fasteners. The secret to the bite is Grip-Tite's patented Advanced Camming Technology (ACT), which locks six floating cams against the flats of the nut or bolt as the socket rotates. The more torque users apply, the more tenaciously the cams grip. ACT also allows the cams to hold fasteners securely (even upside-down) for easy installation in hard-to-reach places. Exceeds ANSI torque specifications. Lifetime warranty.