【High Quality Material】Our screwdriver bit adapters are made of chrome vanadium steel for high hardness, rust resistance, long service life and durability. 【Adjustable】The adjustable depth screwdriver bit holder fixes screws directly at a predetermined depth, allowing for precise use of drywall screws. 【Strong Magnetism】The drill holder is magnetically strong for quick connection or disconnection and ensures that it stays in place while driving. 【Compatible with】1/4 quick hex shank and 1/4 hex socket. Accepts most electric screwdrivers, hand screwdrivers and drills. 【Wide Range of Uses】Magnetic screwdriver bit holders are suitable for extensive conversion of various drill bits and screwdriver bits. Also used for deck construction, wooden windows, plywood flooring, box construction.