This Tie-Lok tool (trigger tension and automatic punch with cut-off) is specifically used with mini Tie-Lok metal ties for fast, easy bundling or tagging. They are used in applications where nylon/plastic cable ties or zap-straps do not stand up to the abuse or the environment - and therefore a metal strap/tie is preferred. This tool must be used with the N70-ASxxx straps/ties (sold 100/bag).