VEVOR - Core Drill Bit, 4 inch Diameter, 14 inch Drilling Depth, 1-1/4 in-7 Internal Thread, High-Precision Welding Technology - Black

This professional core drill bit 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, and foam block applications.