for drilling hard and brittle materials such as marble, ceramics, cement, ceramic tile and so on. The opening is neat, smooth, without broken edge, and will not produce vibration phenomenon. The cutting resistance is small and the opening speed is improved. After slotting, it is easy to decorate and remove chips easily.The products are durable, with sharp blade, smooth chip removal with easy operation. High efficiency screw chip removal, smooth body part, not stick to the knife, drilling more effectively and make it user friendly.

The cutter head of the Granite Hole Saw is made of high quality diamond, high temperature quenching, high hardness, sharp and durable. The slotting design is humanized, the knife head is sharp, the opening resistance is small, which is conducive to chip removal, and the opening is neat without burr. The overall forging of the drill body makes the drill body more stable, without chattering. The handle is triangular, which is more firm for electric drill and vise.

Products used in marble, granite, pebble, vitrified brick, stone, ceramic tile and cement products and other hard materials, specifications from 6-100MM, using high-quality diamond raw materials.

Precautions:
Water or coolant should be added to prolong the service life;
This kind of hole opener has no center drill, so it needs to contact the material slowly with an angle of 45 degrees, and then make accurate positioning after opening a alveolar trace;
About 800-1000 revolutions per minute;
The bigger the hole opener is, the lower the speed is required. When the drill is about to drill through, pay attention to slow down the speed;
When the chip removal is not ideal, stop the work first, and then continue to work after cleaning