Bi-Metal Hole Saws cut only the circumference of the material. Ideal for wood, plastics, and other soft materials. Screws on to a mandrel, sold separately or as part of a kit.
Glass & Tile Drills excel in hard brittle materials. Diamond Glass Drills or "Glass Hole Saws" are coated in an industrial diamond abrasive, and cut the circumference of the hole.
