Features: brand new and high quality Full grinding process, the surface is more smooth, more smooth groove, processed products less burr. Made of alloy fully heat treated, hardened and tempered for longer useful life. The design is an improvement over spade and auger bits. 4 precision ground cutting edges and 4 flutes engineered to optimize performance, easy for chip removing. With self feeding auger point, easy cutting of accurate diameter holes. Woodworking drill bits for ideal for making neat and clean holes into both hard wood and soft wood, plastic, etc. Come with grooved hex shank, can be used in hand drills electric drills drill. Specifications: Material:Alloy Color:Black Cutting Diameter:10mm 12mm 14mm 16mm 18mm 20mm 22mm 25mm Handle Diameter: 6.35 (mm) Size:Mixed Size Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package includes: 11 Pieces Flute Auger Bits/Set