Sk Sockets slotted and Phillips head screws too tight for a screwdriver. Even screws, nuts and bolts with very thin, rounded or tapered heads * Even screws, nuts and bolts with very thin, rounded or tapered heads can be removed. Variety of styles and sizes are also available * Also removes a wide variety a wide variety of other problem fasteners like oil pan plugs, corroded marine nuts and bolts and manifold nuts