SPTA 10Pcs HSS Routing Router Bits Burr Rotary Tools-1/8 (3mm) Shank Suit Dremel Proxxon Rotary Tool For Engraving, Wood Working Tools Cutting edge diameter: 1/8" (3mm),High-Speed Steel Wood Carving Milling Cutter Set Usage: for materials such as wood; plastic; soft metal as aluminum Cutting burs are larger than normal ones which makes it easier to do the wood job Larger cutters work quicker and bits of wood and wood chips will not get stuck. Material: High Speed Steel 4241 ,Ideal for shaping, hollowing, grooving, slotting, inlaying and making tapered holes in soft metals, plastics and woods especially on curved surfaces.