The Arrow ET155 ProShot 3 electric narrow crown staple gun packs 12 amps of powers without the need for a cumbersome air compressor and hose, according to the company. The ET155 fires 3/16-inch width narrow crown staples, in four staple lengths: 5/16-, 3/8-, ½- and 9/16-inch. The stapler can accept Duo-Fast, Stanley-Bostitch and Crain staples, as well as Arrow, the company says.