Abstract: A combined socket is provided, whereby a screw can be driven either by a cross tipped Phillips type driver or by a square Robertson type driver. The wings of the socket have end walls that curve convexly to permit the end wall to be clear of the corner of the square, right down to the bottom of the end wall. The vertical side faces of the socket have portions inclined at different angles. The upper and lower portions are inclined respectively at a greater angle to the vertical and a smaller angle to the vertical as compared to the side faces of a conventional Robertson type socket allowing a Robertson type driver to contact the side faces part way along the faces.

Abstract: A tapered punch for producing a recessed screw, the punch having an axially extending recess forming portion of symmetrical cross section and presenting in cross section 8 symmetrically disposed corners in 45.degree. spaced relation with any 4 alternate corners lying on the corners of one square and the remaining 4 alternate corners lying on the corners of another square in 45.degree. angular relation to the first mentioned square, and a method for cold forming the recess by evenly spreading flow of the metal.