Features: Full grinding process for a smooth surface and smooth groove; processed products have less burr. Made of alloy with full heat treatment, hardened and tempered for longer useful life. Improved design compared to spade and auger bits; 4 precision ground cutting edges and 4 flutes engineered to optimize performance and facilitate chip removal. Self-feeding auger point for easy cutting of accurate diameter holes. Woodworking drill bits ideal for making neat and clean holes in hardwood, softwood, plastic, and similar materials. Grooved hex shank design allows use with hand drills, electric drills, and other standard drilling tools. Specifications: Material: Alloy. Color: Black. Cutting Diameter: 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm. Shank Diameter: 6.35mm. Size: Mixed Size. Note: Due to differences in lighting and screen settings, the item's color may vary slightly from the images. Slight dimensional variations may occur due to manual measurement. Package includes: 11 Pieces Flute Auger Bits per Set