Excellent bit set, especially for this price. Everything you need to drill holes in thin or soft metal. They're ideal for sheet metal, but can also be used on thicker metals like heavy plate if you're patient and use cutting fluid. desired hole sizes. The bits are easy to use and leave cleaner edges than most other bits. The countersinks included in this price are amazing and make this set a great value. They are also excellent for deburring edges. This review will be updated if these bits hold up, but so far they're holding up well.