High-Speed Steel (HSS) Plastic Cutting Straight 'O' Flute Router Bits Provide smooth finish in both soft and hard plastics. Excellent for hand-fed operations.Excellent for cutting: Soft & Hard Plastic Acrylonitrile Butadiene Styrene (ABS) Coroplast* Expanded Polystyrene Foam (EPS) Fomex High Density Polyethylene (HDPE) High Impact Polystyrene (HIPS) Hydroxy-Terminated Polyether (HTPE) Low Density polyethylene (LDPE) LubX Perspex Cast Acrylic Sheet Polycarbonate Polyethylene Polyethylene Terephthalate Glycol-Modified (PETG / PET-G) Polyoxymethylene (POM), also known as Acetal, Polyacetal and Polyformaldehyde Polypropylene Extruded Acrylic Poly (methyl methacrylate) (PMMA) PVC Sign Foam StarBoard (King StarBoard 'R') High Density Polyethylene Sheet (HDPE) Thermoplastic Polyolefin (TPO) Ultra High Molecular Weight Polythylene (UHMW) Urethane Wood*Coroplast is soft plastic cardboard made with super soft, super flexible PVC.Soft Wood MAX RPM: 16,000Soft Plastic MAX RPM: 12,500