STURDY MATERIAL: Made of high-quality carbide, not easy to break. Ensures sharpness and durability for effortless, wood cutting. High hardness, wear resistance, excellent thermal stability, strength and toughness ROUTER BITS SIZE: 4 piece Rabbeting Router Bit with 1/4 inch shank. 6 interchangeable bearings: 1/16 inch, 1/8 inch, 3/16 inch, 1/4 inch, 5/16 inch, 3/8 inch. Different cutting heights: 1/8 inch, 1/4 inch, 3/8 inch, 1/2 inch. Depth of cut (changed by changing bearings) COMPATIBLE MACHINES: For use on CNC and other automatic milling machines as well as handheld and benchtop portable milling machines. Please note: The short clamping of this router bit may cause bending WIDE APPLICATIONS: This panel router bit set is truly versatile and brings you extra convenience. Suitable for use on a variety of materials and surfaces such as wood, MDF, particleboard, plywood, panels, softwood, hardwood, etc. NOTE - Please check the shank size used with your router to avoid ordering by mistake. FEED SPEED AND SPINDLE SPEED: The feed speed is 8-12M/Min, and the spindle speed is 18000-24000RPM. Choose the correct case size and use low speed., Weight: 0.5621787681 pounds, Manufacturer: Kueohse