The Gardner Bender 1-1/4 in. x 9/16 in. Insulated Metal Staples secure a large variety of cable types including: NM, BX, MC, AC and UF cables. The insulator is made from a durable polyethylene material which protects cables and helps to prevent arc faults. Steel staples offer sharp, burr free tips which easily bite into wood upon hammering and deter wood from splitting. Do not drive the staple beyond the insulation stops to achieve a clean insertion and secured wiring without damage to cable or wood.