Surebonder Staples are designed to be used with your Easy Tacker staple gun. Great to use with many home décor and crafting projects. Always wear safety glasses. Heavy Duty 4# 9/16" 1250pc- This size staple is great for upholstery, fabric covering and window covering. Fits Arrow T50, Stanley TR150, Surebonder 5600, 5670, 5685, 5690, and hammer tackers. Package lists other staple guns they can be used with.