This was an experimental piece. Kinda neat. I used a 1/4" hex head cap screw to give me a driver and a press fit magnet inside the screw to retain the bit. A generous amount of red Loctite and I really cranked the screw in there so it probably will hold up well enough. A neat idea but a lot of work to do so I abandoned the project and went with the Captive Bit Series instead.