The Makita DFR550Z 18V Auto Feed LXT Screwdriver has been developed as the advanced model of the BFR440, featuring higher durability. This model features a more reliable casing attachment. It also features an anti-tilt device to prevent screws from swaying as well as dust proof construction for reliability on the job. There is a foldable screw guide that keeps the screw strip tangle free as well as a silent clutch. *Bare Unit only. Use with your existing batteries and charger.