General description Our high-quality 50x400 mm diamond core drill bit is designed for use with electric core drills, making it ideal for drilling into granite, hard stone, concrete, reinforced concrete, and other tough surfaces. Its durable construction ensures smooth operation during use. Technical specifications Size: 50 mm x 400 mm Segment Height: 7 mm Threaded connection: 1 1/4” Delivery contains 1 x Diamond core drill bit Other information