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Diamond crown (drill bit) is designed to be used with an angle grinder. The drill bits made using the new advanced vacuum technology are characterized by durability and high efficiency. These drill bits are designed for both dry and wet drilling of especially hard materials. M14 screw fastening is intended for angle grinders. An angle grinder ensures high rotations needed for the efficient performance of the drill bit. It is an especially effective way for dry drilling of hard materials such as especially hard stone mass tiles. Service life of the drill bit can be prolonged by using water.