Check the listing for details. 30Pcs 0.5mm Diamond Drill Bits Small Grinding Head Burrs Jewelry Tools for Stone. Color: Silver, Condition: New. Listed at 13.99 USD. JINGLING 30Pcs 0.5mm Diamond Coated Hole Saw Drill Solid Bits Jewelry Gemstone Glass Tile Marble Code 5A The diamond coated hole saw suitable for use in drill hole on jewelry, gems, glass, marble, tile or granite Product Specification: Product Name: Lapidary Diamond Drill Bits, Diamond Drill Bits for Stone, 0.5mm Gemstone Drill Bits Head diameter: 0.5mm Total length: 1-21/32" (42mm) Drill depth: 1/8" (3mm) Shank diameter: 3/32" (2.35mm) Suitable for electric nail drill, carving machine, machinery supporting assembly with a 3/32" collet Quantity: 30 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. Never use drills while machine is in hammer action. 3. Holes Require No Futher Work As Cutting Is Clean We Can List Any Size (Head Diameter from 0.4mm - 230mm) & Amount Of This ProductJust a friendly reminder: The Shank diameter of grinding bit is 2.35mm (close to 3/32")There are two different collet sizes for Dremel: 3mm (1/8") or Universal 3-jaw chuckIf your chuck of Dremel(models 4300-8050) has an Universal 3-jaw chuck, then the grinding bit can be installed directlyHowever, it is NOT suitable for dremel with 3mm 1/8" chuck (such as:models 3000,4000)If your chuck of Dremel is 3mm (1/8"), maybe you need add the Universal 3-jaw chuck for Dremel Please let us know if you are looking for other accessories or hardware.