Heavy-duty stainless steel staples. Replacement staples also fit the following make and model staplers: Surebonder 5602, 5600, 5900, 5700, 5800, 5850, 5650, 5685, 5910; Arrow T50, T55, ET50, T55C, ETF50, ETF50P, ETC50, ETC50C, ETN50, HT50A, 50P, CT50K; Black & Decker 6000E, 5700 PowerShot, 4000E, 3000E, 2000E; Craftsman 68434; Duo-Fast DHSA11-10; Master Mechanic 5601MM, 5600MM, 5650MM, 5800MM, 5850MM, M5000, M5500, M5100, 345694, 5700MM, 5900MM; Stanley Bostitch TR85, TR60, TR100, TR200, TRE200, TRE500, PHT150, PHT150C, PHT250C, PHT350, TR45, TR110, TR150, TR150H, TR250, TRE550; PowerFast 10401; Unifix MS15, MS50V, HS50, MS35V and MS35.