The DEWALT DCF6201 20V MAX XR Li-Ion Drywall ScrewGun Cordless Collated Magazine Attachment allows users to quickly convert to and from an auto-feed collated screw driving system. An auto-feed screw system makes it possible to drive screws with a single-hand (great for ceilings), and users can change screw sizes, driving depth & install/remove the attachment without a tool. This magazine attachment has a tool-less screw length adjustment button (1″ – 2″ capacity), a disassembly release button (for occasional blow-out/cleaning), screw length detent marks & screw drive depth gauge, and a collated screw strip guide. It also accepts most major/generic screw strip brands.