Each of the two bits in this pack were held together only by a set screw intended to hold the drill itself in place. The set screw on each of mine was loosened from the box. When I tried to drill a hole, the drill bit broke out on each one. I tried putting it back in and tightening the set screw but the screw came loose and the spring blew all the pieces up. I have never found any of the thin gold discs. I've honestly tried each and even tried assembling and tightening the set screw to bring them together. A fruitless task.