Leaves an Extra High Surface Finish Those seeking improved surface finishes in either plastic, woods and other materials would do well by using Amana Tool's 3 flute, Low Helix Finishers. The unbeatable combination of three keen edges and a gentle 10° helix equates to a stiffer tool that minimizes both part movement and edge burring, leaving a smooth finish. 3 Flute Low Helix Up-Cut and Down-Cut Leaves an Extra High Surface FinishExcellent for Cutting: Plastic Acrylic Stone Acrylonitrile Butadiene Styrene (ABS) Corian Composite Plastic Coroplast* Delrin Foam Fomex Hardwood High Impact Polystyrene (HIPS) Hydroxy-Terminated Polyether (HTPE) Low Density Polyethylene (LDPE) LubX Perspex Cast Acrylic Sheet Poly (methyl methacrylate) (PMMA) Polyethylene Terephthalate Glycol-Modified (PETG / PET-G) Polyoxymethylene (POM), also known as Acetal, Polyacetal and Polyformaldehyde Precision Board Sign Foam Softwood Solid Surface StarBoard (King StarBoard 'R') High Density Polyethylene Sheet (HDPE) Thermoplastic Polyolefin (TPO) Urethane*Coroplast is soft plastic cardboard made with super soft, super flexible PVC.