HTS code 9902.15.24 covers "Rotary rock drill bits, each with cutting part containing by weight over 0.2 percent of chromium, molybdenum or tungsten or over 0.1 percent of vanadium (provided for in subheading 8207.19.30), designed for use with rock drilling and earth boring tools of heading 8430 " 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.