Made of carbon steel for extreme durability. Total length 160 (mm). Ideal for drilling holes in reinforced concrete, for example for fixing interior fittings such as air conditioning, heating pipes, cables and lighting. Package includes: Box of 7 drill bits 5/6/6/8/8/10/12 mm Note: The data is all measured manually, please allow an error of 1-3 cm, because due to the difference in light and display, there may be a certain color difference, the actual object received shall prevail.