Perfect combination of diamond grade and precision manufacturing, provides exceptional products strength and greatly enhanced tool life. Drive adapter incorporate a water delivery system for crown cooling. Anchor and fasten holes for small plugs and anchors.3/16" Continuous diamond crown matrix expose a new cutting surface while drilling for faster cuts and longer life. Unique profile produces very accurate and neat holes with minimal entry and exit damage. Specially designed diamond crown construction reduces drag and allows for easy tile slug removal.