HTS code 9902.15.25 covers "Rotary or fixed cutter drill bits, each with cutting part of precious or semiprecious stones (natural, synthetic or reconstructed) on a substrate of base metal or metal carbide mounted to a base metal body, the foregoing designed for use with rock drilling and earth boring tools of heading 8430 (provided for in subheading 8207.19.60)" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.