ZFE Type one HSS Routing Router Bits Burr For Dremel & Foredom Proxxon Rotary Tools Pack Of 10Pcs. Ideal for shaping, hollowing, grooving, slotting, inlaying and making tapered holes in soft metals, plastics and woods especially on curved surfaces. Compatible with all Dremel rotary tools. A versatile, high-quality cutter made of high-grade steel for use on wood, plastic and soft metals. Material:HSS(High Speed Steel),Shank:1/8"(3.17mm). Best on soft materials,Made of high speed steel.