The BeA AT-A22 carton closing stapler clinches A series 1-3/8” crown staples from 3/4” to 7/8” in length. This air-powered box stapler comes with a one-year limited warranty. Features include a metal body and magazine - for extended service life. The BeA 12100283 AT-A22 is designed to staple corrugated cardboard for closing boxes. Carton closing staplers in the AT-A series have separate adjustments for staple length, depth of penetration, and tightness of clinch. This allows for through and blind clinching of box flaps.