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 secures screws directly to a predetermined depth, allowing for precise use of drywall screws. Strong Magnetism: The drill bit holder is magnetically strong for quick connection or disconnection and ensures 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 a wide range of converting various drill bits and screwdriver bits. Also used for deck construction, wood window installation, plywood subfloor installation, and box building.