Product NameDiamond core drill bit set M14, Diamond core drill bits dry use for marble/tile.
Hole Diameter25mm (close to 1"), Internal Diameter19mm
Total Length60mm, Shank Diameter(Internal Diameter)M14 Thread, Drilling Depth39mm
Excellent for making clean and accurate hole on granite, marble, rock, gemstone, shells, tile and glass etc.
Water or other cooling agent is recommended for longer life of the bit