Perfect handpiece for outstanding precision, or if you keep losing the chuck key, or just find using a chuck key a pain in the rump. This is a quick-release 3/32 inch (only) collet that changes bits in seconds. Just flip the lever on the side, slide out the bit, slide in the new one. It does mean that all your bits, burrs, etc., need to be a 3/32 shaft, but if you are changing bits and tips all the time, this is a god-send.
