Fivepears 4Pcs Flush Trim Router Bits Set 1/4 Inch Shank, Bottom, 1/2" Diameter 1.[Durable] - High-quality carbide inserts bring you a smoother experience, and the strong wear resistance makes it to withstand the test of time in heavy-duty use. 2.[Safety] -FivePears router bit with anti-kickback design provides higher stability and less vibration. The RPM?18000. Pushing slowly can help you get a smoother cut. 3.[Widely used] - This flush trim router bit is suitable for wood, MDF, particleboard, plywood, compact panels, acrylic. Do not cut metal and non-wood materials such as: steel, iron, sand, etc. 4.[Efficient] - For CNC and other automatic routers as well as handheld and table portable routers. Such as woodworking engraving machines, edge trimming machines. 5.[No Risk]: If you have any questions about the product, please contact us. Your issue will be resolved within 24 hours.