ASNOMY 6Pcs Diamond Drill Bits Set,Diamond Core Drill Bits for Tile,Porcelain,Ceramic,Glass,Stones & More –1/4" Hex Shank Tile Drill Bits for Fast Drilling - Sizes 1/4" 5/16" 3/8" 1/2" - AS0158-6P612

• 【Top Quality】Our diamond drill bits made of thickened premium diamond, vacuum brazed diamond technology provides very high efficiency,cuts faster and lasts longer. 【Size】This diamond core drill bits set Includes 2x1/4”(6mm),1x5/16”(8mm),1x 3/8”(10mm), 1x1/2”(12mm),and 1x positioning drill bit. With 1/4 Inch universal hex shank. Total Length: 3-11/16"(78mm). Max working depth: 1-3/8"(35mm). 【Both Dry and Wet Drilling Designs】This tile drill bits are filled with cooling wax, so that they can be directly dry drilling without adding water as a coolant. But in order to extend the use of diamond drill bits, it is recommended to add water or other coolants during the drilling process. 【Widely Application】This ceramic drill bit perfect for drilling Glass, Tiles and Hard Ceramic Tiles, Porcelain, Granite Marble, Quartz, Limestone, Fiberglass, Terrazzo, Porcelain Stoneware, Masonry, Sandstone(not for wood) 【Unique chip flute and Positioning Drill Bit Design】Our diamond tipped drill bits are integrated forging and are specially designed with chip flutes, also equipped with a pilot drill bit, which enables it to drill precise and smooth holes in fragile materials such as glass, porcelain and marble.