This O-flute bit has a cutting diameter of 3/16, cutting height of 5/8, overall length 2 and 1/4 shank. Highlights: - For CNC milling and routing on aluminum and plastics where a clean top 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 - Special geometry for specified material Item Includes: 1 Router Bit O flute spiral router bits are designed to produce clean cuts in acrylic, HDPE, UHMW and other plastics. The spiral downcut geometry shears in a downward direction leaving a smooth top surface finish. O flute bits have a larger cullet than standard spiral bits which allow for larger chips. This alleviates overheating which can cause the material to melt and create rough or deformed cuts.