These spiral 'O' flute router bits are ideal for industrial applications and are manufactured to produce optimum results on every cut, especially when cutting acrylic materials and plastics. Made from high quality carbide, they feature a polished "mirror finish" cutting edge. This means a cleaner cut, reduced risk of chip re-welding, extended tool life and dissipates heat well to prevent melting. Right hand helix right hand cut. These router bits can be used to cut the following materials: Plastic/Acrylic Acetal and Nylon Acrylic Stone Acrylonitrile Butadiene Styrene (ABS) Aluminum Composite Material (ACM) Alupanel® Corian Coroplast® Corrugated Plastics such as Correx Boards and Polypropylene Crosslinked Polyethylene (XPE, PEX, XLPE) Delrin Dibond® Extruded Acrylic Foam Board Fomex® Gatorfoam® Hard Plastic High Density Polyethylene (HDPE) High Density Urethane (HDU Board) High Impact Polystyrene (HIPS) High Impact Polystyrene (HIPS) for digital printing High Pressure Laminates (HPL) Hydroxy-Terminated Polyether (HTPE) King ColorCore® The Multi-Color Engravable Polymer Sheet. Laminate Low Density Polyethylene (LDPE) LubX® Lucite® Mechanical/Engineered Plastics Perspex® Cast Acrylic Sheet Plexiglas® Poly (methyl methacrylate) (PMMA) Polycarbonate (Lexan™)† Polyethylene Terephthalate Glycol-Modified (PETG / PET-G) Polyoxymethylene (POM), also known as Acetal, Polyacetal and Polyformaldehyde. Polystyrene (PS) PVC Sign Foam Sintra PVC Solid Surface StarBoard® (King StarBoard 'R') High Density Polyethylene Sheet (HDPE) Teflon® Thermoplastic Polyolefin (TPO) Trespa® Meteon® Ultra High Molecular Weight Polyethylene (UHMWPE) Urethane Vinyl Flooring Wood Suitable for use with CNC Routers and shouldn't be used with a handheld router.