Cettkowns 15-Pack Diamond Drill Bit Set φ6-50mm HSS Diamond Hole Cutters for Tiles Glass Granite Ceramic Porcelain

• [High Quality] - Made of high speed steel(HSS) with nickel plated, bit's tip head is 80-100 grit diamond coating, good abrasion resistance, high hardness and extreme sharp, high quality and long service life.
• [Precise & Smooth Hole] - Small resistance, center pilot holes and side holes help to remove the waste, easy to cut clean and accurate holes, no broken edges
• [Low Speed Low Pressure More Water] - Work with all electric drill and impact drill, start diamond core drill bit at 600-900 RPM, use less pressure! Let your drill bit drill at it's own pace. Use plenty of lubrication/coolant to keep your drill tip cool and the hole clean.
• [15 Sizes] - 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 35mm, 40mm, 50mm, all at 50mm length, diamond drill bit set with laser marked size, easy to recognize.
• [Wide Application] - Great for making your own glass crafts and projects, wine bottles, glass block, sea glass, tile, porcelain, ceramic, China, granite and more. Not for use on concrete or depths beyond 1/2".

How to Use? 1. Use pen to mark a circle. 2. Start hole at an angle of 45 degree slowly. 3. Make a round trace and then hold diamond drill straight. 4. Slow speed down for exit hole or drill from the other side from the other side to prevent breakthrough. Use Range: - With all your glass crafts and projects - Drill holes in wine bottles and glass block - Drill sea glass to make beautiful jewelry - Drill ceramic tile, porcelain, china, ceramic, fiberglass, marble, granite, quartz, slate, cast iron soil pipe, radiator pipes and more Friendly Reminder: - It is best to start out with a very slow drill speed, very light pressure and lots of lubrication. Gradually increase all three until you reach the point where time spent drilling balances against the cost of more drill bits. Starting slow reduces risks and extends bit life. Always use more lubrication than you think you need. - Do not use on concrete or for depths beyond about 1/2" (12.7mm). Specifications: - Material: high speed steel - Length: 50mm Package Included: 1 x Diamond Hole Cutter 6mm 1 x Diamond Hole Cutter 8mm 1 x Diamond Hole Cutter 10mm 1 x Diamond Hole Cutter 12mm 1 x Diamond Hole Cutter 14mm 1 x Diamond Hole Cutter 16mm 1 x Diamond Hole Cutter 18mm 1 x Diamond Hole Cutter 20mm 1 x Diamond Hole Cutter 22mm 1 x Diamond Hole Cutter 25mm 1 x Diamond Hole Cutter 28mm 1 x Diamond Hole Cutter 30mm 1 x Diamond Hole Cutter 35mm 1 x Diamond Hole Cutter 40mm 1 x Diamond Hole Cutter 50mm