Heavy duty. Steel construction. Uses: Stanley tra 700 series or arrow t50 staples. TRA 704 actual size. 1/4 inch (6mm). TRA705 actual size 5/16 inch (8mm). TRA706 actual size 3/8 inch (10mm). TRA708 actual size 1/2 inch (12mm). TRA709 actual size 9/16 inch (14mm). Applications: Insulation, weaterstripping, carpet underlayment, window screens, shelf lining, hobby and crafts. www.stanleytools.com. Made in China.