SIZE - Diameter - 1/4inch,cutting depth (change by replacing bearing): 1/16inch, 1/8inch, 3/16inch, 1/4inch, 5/16inch, 3/8inch, 4 different cutting height: 1/8inch, 1/4inch, 3/8inch, 1/2inch MATERIAL - Made of high-quality carbide and coating, not easy to break. high hardness, wear resistance, excellent thermal stability, good strength and toughness. Its advantages cost-effective and high efficiency DURABLE STEEL BODY - These router bits made from high-quality alloy blade, makes clean and accurate cuts on all types of wood with excellent resistance to heat. FEEDING SPEED: 8-12M/Min; [Spindle Speed]:18000-24000RPM, please select the correct casing size and use low speed. Cutting depth (change by replacing bearing):1/16inch, 1/8inch, 3/16inch, 1/4inch, 5/16inch, 3/8inch Cutting height:1/8inch, 1/4inch, 3/8inch, 1/2inch Colour:Blue Material:Hard alloy Size::1/4inch Package Contents: 1set * router bit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.