They are made from high quality steel. A good set for all woodwork but not recommended for hardwood. It fits my drill perfectly and they are easy to use. They're sharp enough for both wood and plastic surfaces, which is great. There are 10 different shapes that are enough for me to use in different projects. I like working with wood, I like making small things. It helps me to reach my goals comfortably. Highly recommended for any carpenter like me. It would be ideal if they came with a magnetic plate to hold them all together. Otherwise they are still the perfect set.