Considering the price and number of bits I wasn't expecting miracles. With several similar products with mixed reviews I decided to take a chance and purchase this set. First impression after unpacking; They don't look or feel sharp. It's time to check them out. I bought this to insert a very small sheet of metal into soft pine wood. I'm talking about a 1/16" bit. I got nowhere. I've tried several speeds and all have failed. The metal used for these bits is too soft. I tried to find my way but it just got me going , smoking jaws. Okay, maybe it was user error. After the first beat burned out and was useless, I tried a few more beats at different speeds and a few different soft materials. Rejection, not user error. These beats are just too soft. Life is short and poorly made products like this shouldn't exist Save time and a few bucks by deleting them from your trash.