A punch tool is provided that is adapted to create a pair of spaced apart apertures through a thin-walled work piece when clamped. The device comprises a hand tool having a pair of handles and a tool head comprising a first head portion and a second head portion. The head portions pivot away from each other and bear against one another based on movement of the handles to compress a sheet of material therebetween. The head portions are T-shaped members, in which the first head portion supports a pair of dies and the second head portion supports a pair of punches adapted to be received by the dies. The head portions are clamped together, whereby the dies are punched through the work piece sheet material to form spaced apart apertures. An embodiment of the head portions contemplates an adjustable width for varying the spacing of the punches.

Relates to an improved universal industrial product to be installed on an existing binding or spiral binding machine, capable of binding in all existing binding systems that allow to perform a single set of oblong perforations, according to the paper size, and in which the support or receive the rings, spirals, or combs and binder having multiple size rings, which are currently formed by using machines with different perforation steps. Includes perforation dies having an oblong shape.

A clamping assembly includes a first jaw having a plurality of alternating grooves and lands formed thereon, a second jaw having a plurality of alternating grooves and lands formed thereon, and a spring provided between the first and second jaws. The jaws are pivotable relative to each other. The jaws are attached to a draw stud. The draw stud is formed from an elongated cylinder which has a conventional thread form formed on one end thereof and a plurality of alternating grooves and lands formed on the other end thereof. The alternating grooves and lands formed on the jaws mesh with the alternating grooves and lands formed on the draw stud to mate the jaws with the draw stud.