Enough for wood. I'm giving it two stars because of poor quality control. The record must contain bits #6,8,10,12. A #8 size bit was missing; Instead, there were two No. 6s.
They are all a little smaller than they should be. I know this because I compared the countersunk holes with my set of drill bits and it turned out that my wooden dowels didn't fit as a result. This is unacceptable, every time I give Ryobi a chance I am reminded why they have such a bad reputation. It also dulled in less than 30 cuts in hardwood.
Nowhere on product packaging says it doesn't work on metal (other drill bits work on wood, plastic and metal). So I bought them to countersink a few holes in an aluminum (rather soft metal) bar. The countersinks only lasted ONE APPLICATION before becoming too dull and just spinning when heated. Useless rubbish back then.