Our Milwaukee? 1 in Insulated Cable Staples are used for fastening electrical cables to wood surfaces during the electrical rough-in process. Only compatible with our M12 cable stapler (2448). UL/CUL approved for single or double stacked 14 to 2, 14 to 3, 12 to 2, 12 to 3, 10 to 2, 10 to 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.