Metalab 2 piece twisted O ring; looks like it used to be a combination bit, the nose was removed? Good condition.
It's somewhat a risk to buy a used bit, if you don't know us and know our integrity, you might have reservations. So we offer a 10 day full money back guarantee, if you're not satisfied with the bit, return it to us within 10 days, undamaged, and we'll refund your money. The only thing you'll be out is the return postage.