1/4 inch trim router bit set, 1/2 inch in blade dia. Blade length 10mm, 20mm, 25mm, 38mm. C3 Mini-grain tungsten carbide blades, high-quality alloy steel bodies. Heat resistant coating. Useful for trimming, grooving, etc. Such as DIY project, lettering, and other template work, Suitable for solid wood, particleboard, MDF, plywood, etc. Create cuts. Designed for the hand- and table-mounted router, it can not be used in electric drill & drill machines. Color: yellow 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- and table-mounted router, it can not be used in electric drill & drill machines. The trim router bit must be fully inserted and tightened. Package included: 4* Trim Router Bits Only the above package content, other products are not included. Note: Light 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.