Overview: As described. Experience: Lightweight, drywall, plastic, light wood paneling, or hollow door. Light weight makes it easy to assemble and get to work, no heavy shank and set screws to fiddle with. Hole saws of every size in a compact carrying case. The blades are steel, but not heavy, high-carbon material. Note though that they are perfect for what they are designed for and the 1 inch piece of jaw presses on them and if you press hard you will either bend the shaft or the hole itself seen.