Surebonder, #4 Heavy Duty Stainless Steel 5/16" Staple, Use With Surebonder 5700, 5600, 5650, 5800, Arrow T50, T55, T55C, ET50, ETF50, ETC50, ETn50, Stanley TR100, TR200, TRE200, TR85, TR60, B&D 6000E, Surebonder 5600, 5650, 5700, 1250 Staples Per Box.