For stapling all types of wiring from 1/4" (6mm) to 5/16" (8mm) in diameter. Ideal for installing wiring for telephones, antennas, intercoms, and alarm systems. Can be used on plastic cable, hollow tubing, radiant heat cable, and virtually any application of wire. Grooved guide positions wire. Jam-resistant mechanism. Short span easy compression handle. All steel construction. Chrome finish. For low voltage wire up to 5/16" diameter. Holds 2 strips of 15 insulated staples Model No. 591188 (SKU 357677). 300 staples per pack.