The wekador bit holder with depth stop prevents unlimited screwing the screw into the material the bit holder includes two magnets one on the drive and a ring magnet on the guide sleeve on which rests the screw the magnetic force of the ring magnet is about 1 kg so that larger screws are securely held function description 1 2 unscrew grommet bit insert or remove 3 install guide sleeve back and with locknut according secure delivery without bit