Stanley TRA709MT 9/16-Inch HD Monel Narrow Crown Staple 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  Monel Narrow Crown  fits TR100, TR200, TRE500 series, PHT150, PHT250 and Arrow T-50 Limited Lifetime Warranty