Brand new dewalt genuine product, dt9774 wet diamond core bit 162mm core bit x 400mm length with 1 1/4 unc female fitting. This is a top industrial core bit with 13 segments & 7mm of diamond tip depth. Will fit the dewalt d21582(direct on to spindle) d21583 (straight on to the spindle) d21585 (straight on to the spindle). Will fits other brands again with the relevant adapter. WET DIAMOND CORE DRILLS. Optimised diamond segment design offer the combination of high drilling speed and long life in a wide range of materials. Laser welding prevents segment loss when drilling. Standard 1 1/4unc female thread for easy fitment to DEWALT and other diamond drill brands. 1 1/4 UNC F.