VEVOR - Core Drill Bit, 6 Pieces, 1/2/3/4/5/6 inch Diameter, 14 inch Drilling Depth, 1-1/4 in-7 Internal Thread - Black

This professional core drill bit set features high-frequency high-precision welding for fast, clean drilling. With a 1-1/4 in-7 universal thread, it is ideal for reinforced concrete, red brick, concrete, foam brick, and more.