Ring magnet automatically adjusts to the individual screw. Once in position, it will remain there even at high rotational speeds. ...
Self-Adjusting Magnetic Bit Holder • 2-5/8" Length
Ring magnet automatically adjusts to the individual screw. Once in position, it will remain there even at high rotational speeds. 1/4" bits can be used. Bits can be changed quickly and easily without the need for any tools. Automatically adjustable to the depth of the screw head. No slip rings generated when screwing in screw flush, plus countersinking of screws is possible due to the sleeve receding.