If there is any problem with the product. We are always here to help.If there is any problem, or if you want to ask a question, feel free to send us a message. We will do our best to solve any problem. 10 pieces 6.0mm bottom. This item is in the category "Jewelry & Watches\Jewelry Care, Design & Repair\Jewelry Tools & Workbenches". The seller is "best_tiger" and is located in this country: CN. This item can be shipped to North, South, or Latin America, all countries in Europe, Japan, Australia.