Magnetic ring securely holds the screw onto the bit holder to make driving screws into confined spaces or overhead much easier also ideal for dry lining where the holder releases the screw without breaking the paper it also features an auto bit lock for single hand bit change and a spin sleeve which allows the steadying of the screw start for an even longer service life use wera bitorsion screwdriver bitscontents includes1x ringmagnet bit holder length 57mm