This O-flute bit has a cutting diameter of 3/8, cutting height of 1-1/8, overall length 3 and 1/2 shank. Highlights: - For CNC milling and routing on aluminum and plastics where a clean bottom surface edge of material is required - Premium C3 micro-grain solid tungsten carbide for a high-performance industrial quality tool - For use on CNC, table mount and handheld routers - Polished to a mirror finish from a solid carbide rod for precision & accuracy - O flute design for performance on plastics and aluminum Item Includes: 1 Router Bit This bit is specifically designed for milling aluminum. O flute end mills allow for lots of chip clearance which is essential when milling aluminum. Aluminum creates larger chips than most other materials and bits such as O-flute end mills are recommended for proper chip removal.