Can be used without water cooling to create wall openings for chimney connections, ventilation shafts, extractor hoods, waste water pipes etc. in masonry, sand-lime brick (up to a max. density of 2.0); not for use in concrete! 1 1/4 inch mounting thread Application area: For direct mounting in hand-held diamond drills or diamond drill presses with 1 1/4 inch mounting thread. Can also be used on other machines with the relevant adapters.