#4 Heavy Duty 9/16" Staple, 1250 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, TR110, TR200, TRE100, TRE200, PHT150, 69.500, 69.502, 69.550; Swingline/Powerfast Model 10401; Unifix Models 0038, 10040, & 10070 Staple Guns.