HSS Blacksmith Drill Bit Stepped 13MM Shank Bits Drills Steel Metal 23mm (Pack of 10) Specifications: Product Name: Ground Flute Drill Bit Type: Drill Bit Material: High Speed Steel Color : Black Package Included: 10x Ground Flute Drill Bit Size: 23mm Shank Diameter: 13mm Length: About 150mm Features: 100% Brand New and High Quality. Steam tempered blue finish. Standard helix +118 degree point. 1/2" reduced shank allows cutting of larger holes using a standard 1/2" or 13mm, 3-jaw chuck. Using high-quality high-speed steel, through special treatment, processed iron, steel, plastic, wood，copper, aluminum and other metal materials. Durable, mainly used for bore machining. Note: Please check the pictures.You will have a direct impression on the products about their colors,sizes and function.