BRAND NEW DRILAX 5 Pcs Diamond Drill Bit Set 1/2″ (0.5 in) Wet Use for Tiles, Glass, Fish Tanks, Marble Granite Ceramic Porcelain Bottles Quartz Coated Kitchen Bathroom Shower LampsCustomers come back to purchase more, they tell us that each diamond bit can drill 20 to 30 holes if used with water. Premium Diamond Drilling Tool Set of 5 1/2″ 0.5 inches – Lot of 5 Diamond Drill BitsBest value for 1/2 inch diamond bits. Use with standard hand or upright drillers.These tools do not have center pilot drills. And there is no need for a center pilot drill.Do NOT run dry. Diamond Coated Tools will work best if you use water to keep the tools cool.Shank size is 3/8″ – suitable for all common electric drillers. Lot of 5 pcs. Diamond Drill Bits You will receive 5 bits. 1/2″ inch Bottle & Glass Blocks Glass Tile Slate Diamond Hole Drilling Tool 1/2 inch 1/2 inch diamond coated drill bit You can make lighted bottles and glass blocks Please note that we are selling factory direct products. All our products are 100% brand new without retail packaging. Specifications: Product Name Diamond Hole Saw Hole Diameter 1/2 inch Material Metal, Diamond Particles Color Silver Tone Shank Diameter 1/4 inch Total Length 2 inch’ Weight 2 oz Package Content 4 x Diamond Hole Saw Description: High performance in cutting glass, slate, tile, porcelain, etc. Tiny diamond particles coated tip offers sharp cutting. To prolong its using life, please remember to keep it with coolant sometimes. Should be used with a electric drill, here is not included. 1/2″ Diamond Coated Hole Saw Drill Bit For Making Lighted Bottles and Glass Blocks. This Bit can also be used for drilling Marble, Granite, Fiberglass, Ceramic and Porcelain Tile. FOR ALL AVAILABLE SIZES, PLEASE VISIT OUR EBAY STORE: Diamond Tools – Drill Bits Category EBAY STORE