Special high grade sub-micrograin carbide with very high tolerance grinding for smooth clean cut in acylic, wood, and manmade boards, solid surface material and foam boards. Single O flute design for fast cutting. Increased feed rates allowing for more linear metres in less time. Super high polished cutting edge with unique mirror finish, resulting in clean cuts, less chance for chip re-welding, effortless chip removal, a superior finish and a longer tool life. Downcut for better clamping when machining small workpieces and improved finish on the tops of the board. For use on routers and CNC routers. Up-cut spiral and can be used to plunge cut. Eject chips up or down depending on tool used. Designed for plastic, wood, foam board, acrylic, nylon, PVC, PVC trim boards, polycarbonate, solid surface, HDPE, ABS, UHMW, HIPS, PET, Polystyrene, Polypropylene (PP), Acetal and mechanical /engineered plastics. Specifications • Shank Diameter: 1/4 • Dia Metric: 6.3 • Dia Imperial: 1/4 • C