Stanley TRA709SST 1000 Pack 9/16-Inch Heavy Duty Stainless Steel Narrow Crown Staples For corrosive or marine environments and upholstery work. Color-coded packaging makes size and product selection a cinch Sturdy plastic packaging reduces staple breakage Heavy Duty  Stainless Steel   fits TR100, TR200, TRE500 series, PHT150, PHT250 and Arrow T-50 Limited Lifetime Warranty