Surebonder 55138 Light Duty 3/8-Inch Leg Length, .441-Inch Crown Staples, Arrow JT21 Type, 1000 Count For use in Surebonder Staple Gun models 5525, 5580, ST-3600 For use with Arrow JT21, JT27, T27; Powershot 1000E; Stanley TR45 Contains 1,000 staples per box