Check the listing for details. 25mm 1" inch Spherical Head Diamond Grinding Bit Grit 150 Round Ball Stone Tools. Color: Silver, Condition: New. Listed at 14.99 USD. JINGLING Diamond Grinding Bit 25mm Spherical Head Grit 150 Coated Mounted Points with 6mm Shank Code YDZ-Big-F-YQ-25mm-6-150# Specification: Product Name Diamond Grinding Head Tip Shape Round Ball, Spherical Material Steel, Diamond Head Diameter 25mm ( Close to 1") Shank Diameter 6mm (Close to 1/4”) Total Length 58mm ( 2-9/32") Grit 150 (Medium) Color Silver Tone Package Content 1 Piece Description: Spherical tip, diamond coated head. 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 carbide in ceramic, glass, precious stone, alloy and many other abrasive materials. Diamond grinding head is processes each kind of mold, hard alloy, glass apparatus, ideal correction tools such as jade carvings. The water is required to cool and lubricate when grinding process If there is not enough water to cool, the diamond at the front of the grinding disc will quickly wear off because of high temperature Regular Air postage from China to Worldwides and takes 15-30 days delivery to your home We will send out your order within 5-7 days after payment has been received and cleared. Please let us know if you are looking for other accessories or hardware. We Can List Any Size & Amount Of This Product: Head diameter from 0.8 mm to 50 mm