Uxcell Dry/Wet Sintered Diamond Core Drill Bits for Concrete Masonry Stone 40mm

Suitable for drilling concrete, masonry, hard brick, marble, stone, and other hard materials. Can be dry or wet drilling. To prolong the using life, it is recommended to be used with water for cooling and lubrication. The large clearance hole facilitates the entrance of cooling water and the escape of chips and other particles from drilling. With cutting edge, the core drill bits cut clean and fast holes, and make drilling process much easier. Can be used on electric hand drills and bench drills.