Arrow Fastener 505SS1 T50 Staples, Stainless Steel, 5/16 Inch, 1000 Pk | T50 staples are the world's top-selling heavy-duty staple platform. Made to deliver exceptional holding power, these staples are used for all heavy-duty stapling applications - from installing insulation, housewraps and roofing underlayments to upholstering fine furniture and window treatments. A true workhorse of a fastener, Arrow T50 staples are made to precise specifications on state-of-the-art equipment at our manufacturing plant in saddle brook, NJ, USA.