Insulated staple

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Insulated staples are used by electricians for securing wires, they can be installed with either hammer or staple gun. The insulation is a dielectric, and also a pneumatic buffer to prevent physical damage to the wire's insulation. Specialized staples with shaped insulation are available to fit fragile, large gauge wire, such as coaxial cable.

Source: http://www.hgtv.com/hgtv/rm_safety_electrical/article/0,1797,HGTV_3792_1383236,00.html