9902.15.25 - 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)

This HTS classification applies to specialized drill bits designed for rock drilling and earth boring applications. These bits are characterized by having cutting elements made from precious or semiprecious stones, which can be natural, synthetic, or reconstructed. These valuable cutting surfaces are affixed to a base metal substrate and mounted onto a larger base metal body, ensuring durability and suitability for heavy-duty use within the tools classified under heading 8430.

As a specialized provision within Chapter 99, this code is distinct from the broader categories of general tools or raw materials found elsewhere in the HTS. While siblings at this level represent diverse groups of goods, this specific entry targets a niche industrial application with precisely defined material and functional criteria. Its placement in Chapter 99 signifies its role under temporary legislation or special trade provisions, rather than permanent tariff schedules.

Since this is a leaf node, there are no further subcategories. The classification is precise and fully defined by the description provided. Its purpose is to capture drill bits with a specific combination of high-value cutting materials (precious/semiprecious stones) and their intended industrial application, distinguishing them from other drill bits or cutting tools that may use different materials or be intended for other purposes.