Features: Full grinding process, smooth surface with smooth grooves; processed products have less burr Made of alloy, fully heat treated, 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 allows use in hand drills, electric drills, and other standard drill 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