Dremel 2-Pack 5/16" Cutter with 1/8" Shank is used for shaping, hollowing, grooving, slotting, inlaying, and making tapered holes. It has a speed rating of 25,000 to 30,000 rpm and is made of HSS, making it durable and long-lasting. It is applicable for use on plastic, soft metal, and wood.