huhao diamond gringing bit,diamond burr bits with 6mm shank cylindrical rounded head rotary tool accessories for stone steel cast iron stainless steel ceramics glass jade marble,18mm cylindrical rounded head 18mm is up for auction in Industrial & Scientific. The current bid is $1.50, 93% below the $22.99 MSRP, in New/Like New condition. Bid on this item at our Lavergne - Industrial Blvd Ste D location before the auction closes.