Speciality tool indeed. This is designed to hold a pearl or a bead while you drill a hole through it. The two screws on the top loosen to adjust position, you line the bead up between them, and they have a hole through the middle, and you drill down through the hole. Please read up on drilling pearls before you try this, pearl dust is unhealthy to breathe - so it would need to be done wet. Ditto glass and some stones. If you are going to drill your own holes - this beats the heck out of holding the bead with your fingers.