Arrow’s Medium Duty Staple Gun is robust and designed for light to medium usage. The Arrow T55 All-Purpose Staple Gun is an excellent all-purpose, all-steel staple gun designed to appeal to the do-it-yourself market. Suitable for general use requiring heavy-duty staples, it has a jam-resistant mechanism, a safety handle lock, and a visual staple refill window for easily identification of when it is time to reload.