Feature 1DIAMOND MATERIAL: Made of premium diamond material, the hole opener is strong and sturdy, wear resistant, ensures a long life span. 2WIDE APPLICATION: The hole opener can be used for glass, ceramic tile, marble, ceramic. But the opener cannot be used for metal. 3WORK WITH DRILL: The hole opener works with standard drill is able to provide a faster and cleaner cutting work. 4EASY TO USE: The opener only needs water to lubricate. Keep using lubricating oil or water, otherwise the drill bit will burn. 5PACKAGE INCLUDES: There are 15 pieces openers in different size that you can use them respectively to meet your different needs.SpecificationItem Type: Diamond Drill BitMaterial: DiamondProduct Weight: Approx. 300 g / 10.6 ozProduct Size: Approx. 12.5 x 5.5 x 9cm / 4.9 x 2.2 x 3.5in Application: Used for perforation of glass, marble, ceramic tile, ceramic tile .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List15 x Diamond Drill Bit