Features High Quality Material: The twist drill is made of high-speed steel, which is corrosion-resistant and durable. The honed cutting edge ensures sharpness and precise and smooth drilling of clean holes. Various Specifications: 4 twist drills of different specifications are available for you to choose to meet your different needs. Ideal for your DIY projects and home maintenance repairs. Features: Long cutting edges allow you to drill deep holes with these drills. A sophisticated twist drill will make drilling easier and easier. Made from precision full grinding to ensure smooth chip movement. Wide Application: Suitable for most drilling jobs and materials such as thin metal, aluminum, iron, carbon steel, wood, plastic, etc. Prevents walking and removes debris and particles faster. Please Note:When drilling metal, water lubrication and cooling is required in order to make clean, precise holes. Increased use of water lubrication will extend drill life. Features: 1.Twist drill bits are made of high-speed steel, anti-corrosion and durable to use. 2.4 different specifications of twist drill bits for your choice, meet your different needs. 3.Long cutting edge allows you using these bits to drill deep holes. 4.Incisive twisted drill bits will make the drilling easier and more effortless. 5.Suitable for most drilling jobs and materials such as thin metal, aluminum, iron, carbon steel, wood, plastics, etc. Specification: Material: High Speed Steel Weight: 163-244g/5.7-8.6oz Shank Diameter: 1/2'' Outside edge apex Angle: 130 Size: 16.5mm, 18.5mm, 19.5mm, 23.5mm (Optional) Package List: 2 x Twist Drill  Package List