ECHG 15pcs Diamond Drill Bits Diamond Coated Core Hole Saw 6-50mm Tile Drill Bit for Faucet Wet Drilling Tool Ceramic, Porcelain Tiles, Glass, Marble,Granite Features: [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 [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" Specifications: Material: High speed steel, Diamond coating Length: 50mm Shank diameter: 6mm Color: Silver Cutting Depth: 1/2 "(12.7 mm). 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. Package included: 15 x Diamond Drill Bits (6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 35mm, 40mm, 50mm)
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