Black & Decker ASF100EX Extended Auto Screw Feeder Attachment Extended attachment allows user to drive screws standing up and avoid bending back or working on knees Accepts every day loose screws, Feeder tube holds up to 20 screws at a time Fits to all 3/8" and 1/2" corded and cordless drills, Tool free bit change alllows user to switch from Phillips to Square bits without using a tool 3 depth adjustments for driving screws flush and countersinking screws Tool free jam release allows user to quickly fix jammed screw