Check the listing for details. 10Pcs 6-12mm Spherical Head Diamond Grinding Bits Ball Lapidary Tools for Dremel. Color: Silver, Condition: New. Listed at 11.99 USD. JINGLING 10Pcs 6-12mm Spherical Head Diamond Grinding Bits with 3mm Shank lapidary tools for gemstone Code 60F/80F/100F/120F*3 Specification: Head Shape: Spherical, Round Ball Material: Steel, Diamond Color: Silver Tone Quantity: Only 10Pcs Shank Diameter: 3mm (1/8") Head Diameter: 6mm/ 8mm /10mm /12mm , please choose Head Diameter which you needing Head Diameter Shank diameter Total length Grit Quantity Code 8mm (5/16") 3mm(close to 1/8") 60mm 80 Coarse 10Pcs 80F*3 10mm (3/8") 3mm(close to 1/8") 60mm 80 Coarse 10Pcs 100F*3 12mm (15/32") 3mm(close to 1/8") 60mm 80 Coarse 10Pcs 120F*3 Description: Spherical tip, diamond coated head. Shank Diameter: 3mm(1/8"); Suitable for dremel, electric grinder, carving machine with a 1/8" collet. Used for sculpturing, dressing, precision grinding and internal grinding carbide in ceramic, glass, precious stone, alloy and many other abrasive materials. Just a friendly reminder: The Shank diameter of grinding bit is 3mm (close to 1/8 inch) If your chuck of Dremel is 3mm (1/8 inch) or Universal 3-jaw chuck, then the grinding bit can be installed directly However, it is NOT suitable for machines with 3/32 inch chuck, such as Electric Nail Drill We Can List Any Size & Amount Of This Product: Head diameter from 0.8 mm to 40 mm Regular Air postage from China to Worldwide and takes 10-30 days delivery to your home We will send out your order within 1-2 days after payment has been received and cleared.