Arrow 508 Heavy Duty T50 1/2-Inch Staples are made to deliver exceptional holding power, these staples are used for all heavy-duty stapling applications – from installing insulation, house wraps, and roofing underlayment 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. Works with T50, T50X, T50HS, 5700, T50RED2, T50PBN, T501, HT50, HT55, HTX50, HT55BL, HT50MG, T50ACD, T50DCD, T50AC, ET501F, ET501C, PT50, T50RED2.