AmanaTool's in-Tech(TM) Series insert router bits provides all woodworkers access to the industrial-grade technology at an affordable price.Excellent for cutting:Aluminum, Brass, Bronze, Copper, Gold, Silver & Carbon Fiber (Engraving Only)MDFChipboardSoftwood/HardwoodPlastic/Acrylic Get four uses out of each insert! Once insert knife show signs of wear you can rotate the insert for a brand new cutting edge. Includes one insert knife #AMA-12. Optional MDF replacement knife #HMA-12 available separately. Benefits of the new in-Tech(TM) Series include:Priced comparably to brazed router bits with at least 4 times longer tool lifeSuperior cutting qualityNo re-sharpening costsHarder grade tungsten carbideCutting accuracy remains constant during the life of the insert knifeIdeal for routing softwood/hardwood and harder materials such as MDF & Chipboard