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[VACUUM BRAZED ] Vacuum brazed construction delivers strong wear resistance and longer service life while helping the 18mm hole saw cut porcelain tile marble and stone with steady performance. [FAST CLEAN DRILLING] cutting promotes high drilling speed and creates neat smooth openings reducing chipping during hole opening and coring work on ceramic tile marble brick and wall surfaces. [EASY CHIP REMOVAL] Large chip removal hole design helps reduce cutting resistance during drilling making operation smoother while improving debris discharge for more efficient wet or dry cutting tasks. [M14 THREAD FIT] Built with a standard M14 female thread this drill bit fits angle grinders securely and the quality screw hole interface makes loading and unloading more convenient during repeated jobsite use. [RUST RESISTANT FINISH] Paint spraying treatment helps protect the drill bit against rust and wear while supporting reliable use in wet dry cutting applications on marble stone ceramic tile brick and similar materials.