Steelhead A1138 3/8 in. Galvanized Tacker Staples 5000/box For use with Roofing, Tar paper, Insulation, Upholstery, Lumber Tagging and Poly Sheeting Will fit most A-11 Staplers. 3/8" Leg, 0.42" Crown Wire size : 0.020" thick x .050" wide. Chisel point Resin Collated, Size : 3/8 in. 5,000 count boxes Fits Arrow T50, Rapid 11, Rapid 54 Bostitch TR100, TR200, TRE500, TR100HL, PHT150C tools