Replacement drive and countersink socket with drill bit jammed inside. I can't get it back Worked well for the first three hours. Drive bits are also prone to twisting. The sprockets are so long that they twist quite easily. Frankly, waste of money. For the Ipe you'd better go to Lowes and buy high impact star bits (4 cost about $6) and get a countersink. With this tool I can change the discs in my drill press as quickly as possible.