Astro Pneumatic"s 605ST ONYX Straight Type Punch/Flange Tool includes a 5.5 mm Punch that is designed for easy replacement. This tool performs hole punching and panel crimping and features a rotating head for convenient use. When in use, every pull of the lever delivers a single punch or a single flange crimp with precision control. This tool forms an offset crimped edge on sheet metals for no-bump lay welds. Its design is lightweight, durably constructed and reduces metal fabrication time in half.