CNC Router Bit Collections are made by Amana Tool, the leading manufacturers of cutting tools. Amana Tool AMS-165-K 8-Pc CNC Spektra Extreme Tool Life Coated Plastic Cutting Solid Carbide Spiral 'O' Flute 1/4 SHK Router Bit Collection uses the highest quality sub-micrograin carbide, has a special proprietary edge processing system and features a super high polished cutting edge with a unique mirror finish, resulting in clean cuts, superior surface finish and a longer tool life. The Spiral O flute sharpening/finishing process increases feed rates, allowing for more linear feet routed in less time. Excellent for: 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, 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, Hydroxy-Terminated Polyether (HTPE), King ColorCore, 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/PETG), Polyoxymethylene (POM), also known as Acetal, Polyacetal and Polyformaldehyde, Polystyrene (PS), PVC, Sign Foam, Sintra PVC, Solid Surfaces, StarBoard (King StarBoard 'R') High Density Polyethylene Sheet (HDPE), Teflon, Thermoplastic Polyolefin (TPO), Ultra High Molecular Weight Polyethylene (UHMWPE), Urethane, Wood. SPECIFICATIONS: (d) Shank: 1/4. Set #AMS-165-K Includes the Following Tools: 51441-K, 51504-K, 51446-K, 51417-K, 51404-K, 51511-K, 51405-K, 43607-K.