Screw depth adjustment: The screw depth can be adjusted by turning the nut, and the automatic release ensures that the screws are drilled at an exact depth, making it easier to fill later. [Efficient Work] - The drywall bit is magnetic, it is very easy to change the drill, you just need to place the screw on the drywall bit during work, the screw is automatically adsorbed, you don't need to use your hands to make the work easier, it is safer and faster! [Sizes] - 3 pieces magnetic bit holders with 3 PH2 cross bits, hex shank: 1/4 inch; interface: 1/4 inch. Length: 60 mm. Suitable for all drills and cordless drills. Quality materials Superior - The drywall bit is made of premium chrome vanadium (CRV) steel, long service life. The bit holder features strong and durable properties that can ensure stable and reliable results for long-term use.