TLILY 5 PCs 5/16 Inch 8mm + 3/8 10mm Diamond Coated Drill Bit for Tile Marble Glass Ceramic Hole Saw Core

[Package includes]10 Pieces of Dry Diamond Core Drill Bits Kit for drilling holes diameter of 5/16 inch(8mm) and 3/18 inch(10mm), Sufficient quantity to meet your needs [Apply to]Great for drilling clean holes to hard materials especially tiles, porcelain ground, ceramic glass mirror marble stone masonry brick, Note: not for wood [Dry Drilling Design]Diamond Drill Bit made with wax lubricant inside, which can melt while dry drilling and cool the cutting ; Water can be used as additional cooling to prolong the life of the bit [Wide compatibility]Diamond coating enhances the drilling speed; Round Shank compatible with most machines such as Hand Drill, Angle Grinder, Bench Drill; Depth mark is also useful for precise project Shank Type:Round Shank Steps to drill clean and precise holes: 1. Place the drill at a 45 degree angle, so the drill has the chance to start and will prevent the drill slipping 2. Slowly move the drill bit into a more up-right position and Continue to drill and