------ WORTOOL ------ Product Name : Diamond Coated Hole Drill Bit Set. : Diamond alloy Drill chuck : 10 mm Shank : Round shank Color : Silver Surface treatment : Silicon carbide coating Features : • 100 % Brand newborn and soaring select. Diamond dust hole saw for any power drill to cut nutlike holes in glass, and another materials • Nickel-plated with a diamond dust coating offers superb performance and cutting strength. • unstained and faithful. • For use on wood, porcelain, glass, tile, ceramics and another surfaces relevant : appropriate for Stone, Tiles, Ceramics, Glass and Granite, etc Processing. Package : Diamond Coated Hole Saw Drill Bit Set • M30 : external Diameter 30 mm, Shank Diameter 9.0 mm, Drill Hole Depth 30 mm. 1 • M40 : external Diameter 40 mm, Shank Diameter 9.0 mm, Drill Hole Depth 30 mm. 1 • M50 : external Diameter 50 mm, Shank Diameter 9.0 mm, Drill Hole Depth 30 mm. 1 • M60 : external Diameter 60 mm, Shank Diameter 9.0 mm, Drill Hole Depth 30 mm. 1 • M70 : external Diameter 70 mm, Shank Diameter 9.0 mm, Drill Hole Depth 30 mm. 1 • M80 : external Diameter 80 mm, Shank Diameter 9.0 mm, Drill Hole Depth 30 mm. 1 Pcs for use : freshman, 45 degrees of cant to drill positioning, and then the upright drilling, need bioluminescent pressure and motion speed is slow.In the beginning and the end of the time, should dominance tense drill speed at about 800-1000. Needed add water operation in the drilling hole process, can the service life of the product. : • The thickened glass can not use this product. Prohibited not add water to drill hole.