This is a 18 mm diameter by 450 mm long metal cemented carbide drill bit for concrete, manufactured by Alpen-Maykestag. It is part number 0087701800100. It is designed for drilling in concrete and engineered for high performance and durability. It has a spiral, diamond-edged flute for improved dust removal, and has a DLC coating for extra lubricity, minimizing friction and heat buildup. The hardened steel alloy is engineered for high abrasion resistance, excellent chip flow, and maximum life. This drill bit is suitable for applications in construction, plumbing, electrical work, and in DIY repair projects.