This highly specialized carton stapler is produced specifically for the closing of heavy duty tri-wall corrugated boxes. With a staple that can be up to 1 3/8" in length this stapler is designed for the thickest of cartons. Produced by Carton Closing (ISM) they are referred to as "the giant stapler". It remains the only answer for some heavy packaging jobs. These tools are built to order by the manufacturer.