8207.50.20 - With cutting part containing by weight over 0.2 percent of chromium, molybdenum, or tungsten or over 0.1 percent of vanadium

This HTS classification, 8207.50.20, specifically covers interchangeable tools designed for drilling operations, excluding those intended for rock drilling or earth boring. The defining characteristic of these tools lies in their cutting parts, which must contain by weight over 0.2 percent of chromium, molybdenum, or tungsten, or over 0.1 percent of vanadium. This metallurgical composition is crucial for the durability and performance of the cutting edges in various drilling applications.

While the broader category of "Tools for drilling, other than for rock drilling" encompasses a range of drill bits, this particular subheading distinguishes itself by the specific alloy content of its cutting elements. This detail is critical for tariff purposes, as it often correlates with the intended industrial use and expected lifespan of the tool.

Within this classification, further subdivisions exist to provide more granular detail. These subcategories allow for the precise identification of specific types of drilling tools, such as those designed for masonry, and also include "twist drills" and a general "other" category for drilling tools that do not fall into more specific classifications. This structure ensures accurate reporting and duty assessment based on the exact nature and intended application of the drilling implement.