The perfect tool accessory for any flooring, wood or upholstery job, these Spec Ops Heavy Duty Staples, 3/8 inch are compatible with all Spec Ops Staple Guns and Hammer Tackers. These, *T50 style, galvanized steel standard staples were developed for optimum performance in most heavy duty needs. Manufactured with galvanized steel, these staples are also resistant to rust. *T50 is a registered trademark of Arrow Fastener company