This VEVOR 6-piece diamond core drill bit set includes 1, 2, 3, 4, 5, and 6 inch sizes for wet coring applications in concrete and masonry work. It is designed with a 1-1/4 in-7 universal inner thread for compatibility with handheld drills and stand drills. The bits use laser welding and carbon steel construction for durability during demanding drilling jobs. Precision-ground teeth ensure smooth, burr-free edges and faster, accurate cuts. It is a versatile solution for contractors, installers, and construction projects.