A complete hole saw set for the price of a hole saw anywhere else. I used four of these to cut holes in a sheet of aluminum pressed against a piece of wood. They made holes that required very little additional cleaning. The first hole "walked" on me a bit, but lighter pressure cured that problem on subsequent holes. The saw teeth are very sharp, so handle them carefully. Each hole saw is packed in its own plastic box, but the whole set comes in just one carton. Maximum depth of cut is approximately 1/4 inch and saw diameter is in metric units. Sturdy construction and incredible value.