2 in. nominal bit size outer diameter 1-1/4 in. - 7 thread size General purpose bit designed specifically for coring smaller numbers of specific size holes Conforms to Diamond Core Drilling Manufacturers Association standardsMilwaukee Diamond Bits are designed for fast, efficient coring in a wide variety of concrete, including poured, steel reinforced and pre-stressed, as well as asphalt. Our CONTRACTOR SERIES bits have crowns and diamond segment designed for low cost drilling of smaller numbers of specific sized holes. A 14 inch tube length is standard. The bit incorporates a 1-1/4 - 7 threaded back for attachment to the Diamond Drill Motor. A Thread adapter may be needed to attach this bit to your diamond drill motor. Check drill thread specifications. The Diameter of this bit is 2 inch.