Surebonder Heavy Duty Staple Gun uses #4 Heavy Duty Staples, #8 Heavy Duty Brad Nails & #9 Heavy Duty Pin Nails Or Arrow T50 Staples 1/4" - 9/16". It has a 3/8" staple crown size and a maximum staple length of 0.5625". It is compatible with Arrow T50 staples. It comes with a 90-day limited warranty.