● Multipurpose drilling for stone, masonry, tile/ceramic, granite, and marble ● These diamond-tipped drill bits have built-in wax cores that automatically absorb and diffuse heat as you go drill dry and use water for extended periods of time. ● Wax inside for cooling, Dry drilling without water. Very high efficiency, multi-purpose drilling. Long life drilling. ● With vacuum brazed diamond technology, you may cut more quickly, efficiently, and with longer lasting results. Specification ● Hole drill size: 5/6/8/10/12/14/16mm ● Material: Diamond ● Shank: 6.35mm Hexagon Shank ● Diamond Length: 10mm Package Included 1 x Diamond Coated Drill Bit Set