The MILWAUKEE 1″ Insulated Cable Staples are used for fastening electrical cables to wood surfaces during the electrical rough-in process. Only compatible with The M12 Cable Stapler (2448). UL/CUL approved for single or double stacked 14-2, 14-3, 12-2, 12-3, 10-2, 10-3 (single only) NM-B cable installation. Also suitable for use with low voltage cables such as CAT3, CAT5, CAT6, and Coax. Each package includes 600 staples.