CFR › Title 21 › Part 882 › §882.430021 CFR §882.4300Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. Manual cranial drills, burrs, trephines, and their accessories are bone cutting and drilling instruments that are used without a power source on a patient's skull.(b)Classification. Class II (performance standards).