Material: Made of Teflon coating, carbon steel and alloy, high quality welding, stable and efficient quality and long service life. Appearance: The sturdy steel body has an anti-kickback design and is precisely polished to form a smooth cutting surface. Features: With the accumulation of high-quality ball bearing and heat-resistant Teflon coating, wood edges can be cut precisely and cleanly. Application: The top bearing milling head set can cut all components and can be used to process solid wood, medium density fiberboard, chipboard, plywood, etc. Package includes: 3 pieces of router drill bits (cutting height: 30 mm / 40 mm / 50 mm, cutting diameter: 14 mm / 16 mm / 16 mm).