I bought these bits to drill out old screws and bolts of various sizes so I could get them out. The bits worked well and I've also used them to drill some holes in wood, which they do very well. Great set for homeowners! mandatory set! All other bits and screws were added bonuses for me. So far I am satisfied with their work, I am sure that this set will serve me for many years. and the price was definitely right Highly recommended!