Brand new dewalt genuine product, dt9744 wet hard for granite & marble diamond core bit 65mm core bit x 350mm length with 1/2 bsp male fitting. This is a top industrial core bit with 7 segments & 7mm of diamond tip depth. Will fit the dewalt d21582(direct on to spindle) d21583 (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 1/2 bsp male thread for easy fitment to DEWALT and other diamond drill brands.