This cutter set contains a range of the most widely used cutters for decorative woodworking. Powder-coated for extra durability Each bit is powder coated for an extra layer of protection. This allows you to use your router bits multiple times without compromising the quality of the bits. Stay Organized: Includes case for easy storage when not in use. They are all nicely labeled with the little picture to show what kind of cutting each bit will do. Not suitable for metal, stone, and other non-wooden materials: Can be used for hardwood, softwood, synthetic board, and so on to produce a smooth surface, but to avoid processing copper, iron, and other metal materials and sand, stone, and other non-wood materials 12PCS 1/4" carbon carbide shank router bits with Plastic case. It is the best woodworking helper for carpenters and hobbyists. Specification: Material: carbon steel, YG8 alloy Color of bit: Red Packing: Plastic box Shank Diameter: 6.35mm / 1/4"