Concord Blades CBW01500SP 1-1/2 Inch Wet Concrete Diamond Core Drill Bit 10 mm segment height, 3.3mm Segment Width, 5/8"-11mm Arbor Use Wet Only This core bit is used for wet drilling on cured concrete with hard aggregate and medium to heavy steel reinforcement, and asphalt overlay on concrete Does not come with a pilot bit 14" tube length