Abstract: A screw package comprising a carrier strip through which the screws extend transversely with the essentially flat under surface of the screw heads resting against the upper surface of the strip. The strip has holes the diameter of which is closely related to the shank diameter of the screws. Around each hole there extend arcuate slots, between the ends of which comparatively weak webs have been left, or deep weakening lines, in such a manner that, as a screw is driven in, a washer consisting of the carrier strip material will be separated from the carrier strip to be clamped between the under surface of the screw head and the work piece wherein the screw is applied.

Abstract: An internal spline drive formation for screws is provided wherein the spline drive formation comprises a plurality of circumferentially alternating equiangularly spaced grooves and splines, said splines being defined in part by part-cylindrical surfaces and said grooves being defined in part by surfaces which, when viewed in plan, are arcuate to form a parabola-like line in that the radius of curvature is very small at the regions of intersection between the spline side surfaces and the groove bottom and increases gradually towards the center line of the groove bottoms.Also disclosed is a screw driving tool the bit end of which comprises an external spline drive formation having a surface which, when viewed in plan, comprises an outer cylinder having sunk therein a plurality of equiangularly spaced grooves, defined in part by re-entrant part-cylindrical surfaces, the regions of intersection between said grooves and said outer cylinder being sharp as contrasted to curved.

Abstract: A screw driver bit for use with power screw drivers having at the mounting end thereof three equiangularly spaced axial recesses which form three equiangularly spaced drive surfaces for engagement by mating surfaces within a drive socket in the power screw driver.