Super-hard carbide burrs used in a high-speed die grinder can really make a tough job easier. Grind weld beads, shape parts, smooth rough castings, port cylinder heads. All burrs have a 1/4″ dia. shank. Burr sets include: cylinder, pointed tree shaped and round nose. Individual burrs are available separately. Use these above burrs for Steel and Iron. Use (46060) 6″ Tree Shaped Burr for Aluminum.