Holds the screw in the correct starting position without wobbling or disengaging from the insert bit. Accepts No. 10 and smaller screws. Uses all types of 1" insert bits with a 1/4" hex shank. Permanent magnet holds screw to insert bit. 5-1/4" L. Includes No. 1 and 2 Phillips, and 8-10 slotted insert bits. Carded.