Lightweight die-cast aluminum housing design for durability; anti-jam magazine prevents jams and misfires; heavy-duty stapling mechanism for durability; surface guard to prevent damage to underlayment material; ergonomic design is weighted forward for comfortable use; uses Dewalt Heavy Duty Staples series DWHTTH700 available sizes 5/16" (8mm), 3/8" (10mm) and 1/2" (12mm), also uses same range of Stanley TRA700 series Heavy Duty Staples plus Arrow T-50 Heavy Duty Staples.