Check the listing for details. 30Pcs 3mm 1/8 inch Cylindrical Tip Diamond Grinding Bits Carving Tools for Stone. Color: Silver, Condition: New. Listed at 14.99 USD. 30Pcs 3mm 1/8" inch Diamond Grinding Bits Coated Jewelry Tools for Gemstone Glass Tile Code 30A Cylindrical tip, the diamond coated grinding bit is suitable for grinding or carving on jewelry, gemstone, glass, tile or granite Product Specification Product Name: diamond grinding head cylinder Tip Shape: Cylindrical Head diameter : 3mm (Close to 1/8") Total length : 1-21/32" (42mm) Head length: 3/8" (10 mm) Shank diameter: 3/32" (2.35mm); Suitable for electric nail drill, carving machine with a 3/32" collet Quantity: 30Pcs Use with water as a lubricant Adding water when use the diamond grinding head is good, can improve the sharpness and the life Can be installed on the electronic grinder, hanging mill and hand electric drill (not included here) Used for sculpturing, dressing, precision grinding and internal grinding in ceramic, glass, precious stone, alloy carbide and many other abrasive materials Quick Tips 1. The water is required to cool and lubricate when grinding process 2. Never use drills while machine is in hammer action We Can List Any Size (Hole Diameter from 0.4mm - 40mm) & Amount Of This Product 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. Just a friendly reminder: The Shank diameter of grinding bit is 2.35mm (3/32" inch)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