Features: Dimensions int the product name are Cutter Diameter X Shank Diameter X Length of Cut Aluminum cut burs have more aggressive cutting edges for rapid stock removal with minimum chip Ideal for aluminum and other non-ferrous materials Magnum solid tungsten carbide Made in the USA Drillco 7AAL124 - 3/8" x 1/4" Shank SA-3NF Cabide Burr For Aluminum