These Rapid No. 7 Cable staples 12 mm have a rounded crown. They are flatwire staples which are specifically designed for fastening low voltage cables up to 50 V such as computer, hi-fi speaker or telephone cables. They can secure cables up to 6 mm in diameter. 12mm Leg Length For cable diameter up to 6mm Contains 960 staples in a narrow blister pack For use with Rapid- R36, MS2.1, MS4.1, M30, Multitacker