Hi-Flow gunine carbide burr cylinder shape flat end(non-cutting). Hi-Flow Genuine Carbide Burrs give you optimum performance in a wide variety of cutting and milling applications, regardlees of the materials hardness. Specify double or diamond cut for steel, iron, stainless or other ferrous metals. Use single cut for aluminum and non-ferrous metals and plastics. Commonly used with air and electric die grinders with 1/4 chucks, 1/8 dia shanks are available in most shapes for the Dremmel tools