Anti-jam magazine prevents jams and misfires. It has a surface guard to prevent damage to underlayment material. Ergonomic design is weighted forward for comfortable use. Uses DEWALT® Heavy Duty Staples Series DWTTH700, available sizes 5/16″, 3/8″ & 1/2″. Also uses same range of Stanley® TRA700Series Heavy Duty Staples plus Arrow® T-50 Heavy Duty Staples