T50; Professional Hammer Tacker Patented jam-proof mechanisms Precision-locked rear loading Retractable striking surface to prevent damage Specially-designed power grip handles All-steel construction High-carbon, hardened-steel working parts Durable chrome finish Uses T50; Staple Sizes: 5/16-in / 8mm 3/8-in / 10mm 1/2-in / 12mm Arrow T50 Professional Hammer Tacker