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JINGLING 20Pcs 3mm 1/8" Diamond Drill Bits Coated Hole Saw Tools For Glass Tile Stone The 3mm diamond hole saws suitable for use in drill hole on glass, tile, ceramic, marble or granite Hole/Outer diameter: 3.3mm (close to 1/8") Inner diameter: 1.5mm ( close to 1/16"), only the front part of the drill bit is hollow Total length: 50mm (close to 2") Drill depth: 5mm (3/16") Type: Core drill bit Material: Steel, Diamond Grit: 80 (Medium) Quantity: Total 20 Pcs Shank diameter: 2.6mm (close to 3/32") Applicable machines: Fit in a Wen rotary tool with the correct chuck, handheld or upright drillers Recommended speed: 5000-10000 rpm Drilling speed: Drill a hole in seconds Use with water as a lubricant Quick Tips 1. Please add water for coolant and drill slowly 2. Start drill at 45 Degree to surface and align to 90 Degree as hole forms 3. Never use drills while machine is in hammer action 4. Holes require No futher work as cutting is clean How to use a hand drill to drill holes in the glass/tile/stone? Step 1. The bit on the glass/tile/stone 45 degree, open a half-moon notch on it Step 2. Slowly up the bit to 60 degrees, and then gently drill Step 3. Reached 90 degrees, continue to drill Step 4. Drill through the glass/tile/stone finally, the technique requires a "wobble" of the drill rather that steady pressure straight on We can list any size & amount of this product: hole diameter from 2.5mm to 230mm Welcome to Visit Our Store: www.amazon.com/shops/DiamondTools30