SKs most unique socket line to date, the new TurboSocket design works to improve socket grip as more torque is applied. These Made-in-the-U.S.A. sockets easily remove damaged or rounded nuts and bolts with no hammering involved. Simply place the socket on the fastener, and turn. The versatile SK TurboSocket removes anything from oil pan plugs to corroded marine nuts and bolts. Slotted and Phillips head screws too tight for a screwdriver can easily be extracted with the SK TurboSocket. They can even be utilized with a variety of power tools. Set Contents: 16 pc. 1/4" Dr. Set: 1/4" - 3/8" / 6-10mm TurboSockets