The Milwaukee 4932399755 is a DCHXL Dry-Cutting Diamond Core Drill Bit (also referred to as a diamond drilling crown). It is a professional-grade accessory manufactured by Milwaukee designed for heavy-duty dry drilling into concrete, masonry, and similar materials. Key Specifications & Features. An integrated working length of. And an overall length of 525. It uses a standard. 1 1/4? UNC female thread reception. To mount onto compatible diamond core drilling machines. 10 mm high segments. That are laser-welded onto the steel body for extended service life and enhanced durability. This core bit must be used with the drilling machine set to. Not suitable for hammer or percussion action. As impact can shatter the diamond segments. It is part of the DCHXL range, optimized to work efficiently alongside integrated dust extraction systems to keep the work area clean and prevent the bit from binding.