Arrow's T50 1/2-inch staples are made of .050 wire with a 3/8-inch crown and 1/2-inch leg length. They come 1,250 to a pack. Steel - Low Corrosion Resistance. Ideal for indoor applications. T50 staples are the world’s best-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. COMPATIBLE TOOLS: T50, T50HS, 5700, T50X, T50PBN, HT50, T50ACD, T50DCD, T50AC, PT50, T50RED2. Equivalent to Stanley TRA708T.