I used the included attachments at a great price and it took me almost 9 minutes of hand drilling to pierce the conch shell. However, it is decent value for money. Don't expect great results from it and you won't be disappointed. For those who complain about broken bits, you will break small bits of any quality if you don't set them to the right depth or if you press too hard on the side without keeping them straight. Invest in some decent branded attachments that are suitable and sized for whatever job you want them to do and you're done.