Yato YT-4361 Masonry Drill Bit with Cylindrical Shank is a must-have tool that is suitable for professionals or enthusiasts. It is made from high-quality high carbon steel (HCS) with a cylindrical handle (Shank). The working insert is made of high-quality high carbon steel (HCS). Perfectly built to perform precise drilling in concretes in industry and crafts. Drill bit diameter: 4 mm.