Features： 1、Diamond Material: A hole opener is made of high quality diamond material, with fast drilling speed, saving time and effort 2、Improve Work Efficiency: This is a hole opener that can improve work efficiency, fine workmanship and super wear resistant 3、Fast Drilling Speed: This hole opener has a pointed head, fast drilling speed, and a large displacement cutting design 4、Wide Range of Applications: This is a hole opener suitable for drilling granite, ceramic tiles, concrete, marble and other materials 5、Long Service Life: This is a hole opener, with long service life, which is cutting smoothly, and without chipping Specification： Item Type: Diamond Drill Bits Material: Diamond Colour: Black Holes Diameter: Approx. 55mm / 2.17in Total Length: Approx. 60mm / 2.36in Internal Thread: M14 Scope of Application: for marble, granite and other stone openings Package List： 1 x Marble Hole Saw