CFR › Title 21 › Part 882 › §882.446021 CFR §882.4460Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. A neurosurgical head holder (skull clamp) is a device used to clamp the patient's skull to hold head and neck in a particular position during surgical procedures.(b)Classification. Class II (performance standards).