Blue Spot 20200 5 Piece Hex Shank Auger Drill Bit Set Features and Benefits: Manufactured from heat treated high speed carbon steel for increased durability. Specially designed for fast and accurate drilling in timber and man-made boards. Precision fine pitch spiral point and single spur type wood drills. Hex shank. Spiral point. Single spur. Includes sizes 10, 13, 19, 22 & 25 mm.