The Milwaukee® Diamond Bit Adapter increases your capacity for concrete coring on the jobsite. The threaded bit adapter reduces thread size from 1-1/4"-7 to 5/8"-11 so you can connect smaller diamond core bits and extensions to Milwaukee DYMODRILL™ motors. Made of high-quality steel with a diamond core, the adapter offers long-lasting performance when drilling into a variety of types of concrete, including asphalt, pre-stressed, poured and steel reinforced. The adapter is part of Milwaukee's complete line of heavy-duty diamond coring bits and accessories.