Check the listing for details. 20Pcs 4mm 5/32" Diamond Hole Saws Glass Drill Bits Masonry Tools for Stone Tile. Color: Silver, Condition: New. Listed at 12.99 USD. JINGLING 20Pcs 4mm 5/32" Diamond Coated Hole Saw Drill Bits For Glass Tile Ceramic Granite The diamond coated hole saw suitable for use in drill hole on glass, marble, tile or graniteProduct Name: Diamond tip drill bit, Glass hole saw bit, Glass drill bitHole/Outer Diameter : 4mm (close to 5/32") Total length : 50mm (2") Drill depth: 10mm (3/8") Shank diameter: 3.5mm Quantity: Total 20 Pcs 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 We Can List Any Size & Amount Of This Product: Hole diameter from 0.4mm to 230mm Please add the water to cool the drill bit while drilling hole process The Diamond Hole Saw Does NOT Have Center Pilot Drill There is no need for a Pilot Drill Bit, because pilots are not safe for glass/stone. 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 will send out your order within 1-2 days after payment has been received and cleared Please let us know if you are looking for other accessories or hardware.