Simple and effective to use for fully cylindrically turned nuts screws bolts and studs suitable for percussion drills or hand ratchets the sharp edges of the special milling process of the socket wrench grip the screwed down nuts screws bolts or studs and effortlessly unscrew them for 12 drive contents 1 mandrel for removing cylindrically turned nuts screws and bolts from the socket wrench sizes 10 13 15 17 19 mm packed in a sturdy plastic box 10 year warranty