Check the listing for details. 30Pcs 3mm 1/8" OVAL Tip Diamond Solid Bits Ellipse Grinding Head Tools for Stone. Color: Silver, Condition: New. Listed at 14.99 USD. JINGLING 30Pcs 3 mm 1/8 inch OVAL Tip Diamond Mounted Point Grinding Head Lapidary Carving Tools Code 30G*2.35mm Product Specification: Product Name: Diamond Grinding Head Head Diameter : 3mm (Close to 1/8") Total Length : 42mm (1-21/32") Shank diameter: 2.35mm (3/32") Suitable for electric nail drill, carving machine, machinery supporting assembly with a 3/32" collet Grit: 150 Medium Quantity: 30 Pcs Head Shape: OVAL Tip Speed: 2800-30000 RPM, electric grinder speed as high as possible. The diamond mounted point can be installed on the electric grinder, hanging mill and hand electric drill (not included here). Never use drills while machine is in hammer action. Description: OVAL Tip Shape , electroplated diamond head. Product use: Apply to stone carving, jade carving, Gem peeled, bone carving, egg decorating, glass carving etc. Used for sculpturing, dressing, precision grinding and internal grinding carbide in ceramic, glass, precious stone, alloy and many the abrasive materials Use with water as a lubricant Note: carving must use cold water to cool the workpiece and the grinding head polishing, moment also can't do without water We Can List Any Size (Head Diameter from 3mm - 6mm) & Amount Of This Product Just 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 chuck If your chuck of Dremel (models 4300-8050) has an Universal 3-jaw chuck, then the grinding bit can be installed directly However, 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 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.