2 & 4-Flute, Solid Carbide Up-Cut Spiral Ball Nose Router Bits for Superior Surface Finish, Excellent for Cutting Plastic, Acrylic, Solid Surface & PlexiglasA(R)Amana Tool's high mirror-finish solid carbide up-cut spiral ball nose router bits are designed to eliminate tool marks that commonly appear when used with plastic and solid surface materials. Due to the highly polished finish and unique tool geometry, the spiral ball nose router bit delivers superior surface finish of at least 28 Ra (roughness average) in various materials. The up-cut router bits also eject chips up to help prevent chip out on the bottom of the material. Constructed of special grade solid carbide, the Amana Tool spiral ball nose router bits last longer than traditional router bits and deliver superior cutting performance in materials including plastics, solid surface, aluminum, wood composite and natural wood. The bits are ideal for use in a variety of applications spanning the mechanical, medical and woodworking industries.Designed to cut the following materials:PlasticAcrylicAcrylic StoneAcrylonitrile Butadiene Styrene (ABS)AuminumCorianCoroplastA(R)*FomexA(R)High Impact Polystyrene (HIPS)High Pressure Laminates (HPL)Hydroxy-Terminated Polyether (HTPE)Low Density Polyethylene (LDPE)LubXA(R)Non-Ferrous MaterialsPerspexA(R) Cast Acrylic SheetPlexiglasA(R)Poly (methyl methacrylate) (PMMA)Polyethylene Terephthalate Glycol-Modified (PETG / PET-G)Polyoxymethylene (POM), also known as Acetal, Polyacetal and PolyformaldehydeEthylene-Vinyl AcetateSign FoamSolid SurfaceStarBoardA(R) (King StarBoard 'R') High Density Polyethylene Sheet (HDPE)Thermoplastic Polyolefin (TPO)Sign FoamSolid SurfaceStarBoardA(R) (King StarBoard 'R') High Density Polyethylene Sheet (HDPE)Thermoplastic Polyolefin (TPO)Urethane* CoroplastA(R) is soft plastic cardboard made with super soft, super flexible PVC.