Dry Diamond Drill Bits Set, 5 Pcs., Round Shank 1/4, 5/16, 3/8, 1/2 Inch, With When renovating your kitchen or bathroom wallsor fastening mirrors in bathroom or installing shower, you will need to drillholes on mirrors or tiles without cracking them, hence you will need to usethese diamond drill bits to make those holes very precise Our porcelain diamond core drill bit uses vacuum brazed technology, so the bit can be usedat a higher temperature cutting harder materials, great for drilling clean holes to granite, ceramic, glass stone brick andmarble tile stone Jars and similar materials (not for wood) Dry diamond drill bit integrates wax lubricant inside of the bit. During drilling,this integrated lubricant will melt to cool the cutting surface, perfectfor project which lubricant is not applicable. If additional cooling isrequired, water can be used to prolong the life of the bit and to remove thedebris during the drilling process. Steps to drill clean and precise holes? 1. Start Drilling the hole in anangle about 45 degrees to the surface, so the drill has the chance to start andwill prevent the drill slipping 2. Slowly move the drill bit intoa more up-right position and wobble the drill bit in the circular motion 3. Do not need to apply much pressure,let the drill bit do the work, you will feel the drill bit break through theback of the glass or tile once the hole is completed 4. Take care when using them as abit can glaze and burn out if use too fast Package includes? 2 x Bits diameter of 1/4 inch(6mm), 1 x Bit diameter of 5/16inch (8mm) 1 x Bit diameter of 3/8inch (10mm), 1 x Bit diameter of 1/2inch (12mm) 1 x Storage case Product Features Add Versatility to Your Tool: 5 Pieces of Dry Diamond Core Drill Bits Kit for drilling holes diameter of 1/4 inch(6mm), 5/16inch (8mm), 3/8inch (10mm) and 1/2inch (12mm); Vacuum Brazed Diamond Technology: Great for drilling clean holes to hard materials especially tiles, porcelain ground, granite ceramic glass mirror marble stone masonry brick (not for wood) Dry Drilling Design: Diamond Drill Bit integrated with wax lubricant inside which melts while dry drilling and cools the cutting surface; Water can be used as additional cooling to prolong the life of the bit Unique Details: Diamond coating enhances the drilling speed; Round Shank compatible with most machines such as Hand Drill, Angle Grinder, Bench Drill; Side flutes help to remove debris and drill holes smooth and fast; Depth mark useful for precise project Worry Free: This Diamond Drill Bits set comes with a portable storage case for convenient use and store. If you encounter any problems in using the products, please feel free to contact us for satisfactory customer service Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!