[Features] This is an insulated staple designed with a plastic insulator and compliant with UL standards. Sizes fit NM (Romex [upper R]) cable gauges such as 14/3, 14/3G, 12/3, and wires up to 11/32 inch x 19/32 inch (9 mm x 15 mm). This staple is designed specifically for use with KLEINTOOLS cable tacker (450-100).