Arrow's HT50 Professional Hammer Tacker is made with a chromed steel housing, all steel working parts hardened in a 1,500 degree furnace, & a high impact sure-grip handle. Its reliable & time-proven rear load magazine holds two full strips of T50 staples to minimize loading time. For roofing, insulation, housewrap & other professional jobs, there is simply no substitute. Works with Arrow T50 Staples 5/16" (8mm), 3/8" (10 mm), 1/2" (12 mm).