Usage Tips:1/4 inch shank flush trim router bit set, 1/2 inch in blade dia. Blade length 10mm, 20mm, 25mm, 38mm. C3 Mini-grain tungsten carbide , high-quality alloy steel bodies. Heat resistant PTFE coating. Useful for trimming, grooving, etc. Such as DIY project, lettering, and other template work, Suitable for solid wood, particleboard, MDF, plywood, etc. Create very smooth cuts. Designed for the hand-held and table-mounted router, it can not be used in electric drill & drill machines. Color: yellow Shank diameter: 1/4 inch Blade diameter: 1/2 inch Blade length: 10mm, 20mm, 25mm, 38mm Material: Cemented carbide Weight: 4.6 ounces Note: Designed for the hand-held and table-mounted router, it can not be used in electric drill & drill machines. The flush trim router bit must be fully inserted and tightened. Package Contents: 4* Trim Router Bits 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.