This screw attachment with ” hexagonal socket and depth stop reliably helps you to countersink a series of screws perfectly, whether in big or small drywall projects. Inserting every screw to the correct depth guarantees optimal fastening of the gypsum plasterboards and makes the subsequent filling work easier. To do this, adjust the magnetic bit holder with depth stop to the necessary insertion depth once and then produce a series of exact fastenings. The patented plastic cap has a window that guarantees you an unobstructed view of the bit and the screw, so you can see how the work is progressing at all times. You can replace the bit as necessary. A Phillips 2 bit is included.