Surebonder, #4 Heavy Duty 1/2" Staple, 5000 Staples Per Box, For Use With Master Mechanic Models 5600MM, 5700MM, 5800MM, M5000, M5500 & M5100, Arrow Models T50, T55, ET50, ETN50, ETF50, ETF50P, HT50A/50P, Black & Decker Models 2000E, 3000E, 5700P & 6000E, Craftsman Model 68447, Stanley Models TR60, TR85, TR100, TR200, TRE100, TRE200, PHT150, 69.500, 69.502, 69.550, Swingline Power Fast Model 10401, Unifix Models 0038, 10040, & 10070 Staple Guns, Bulk.