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From Wikipedia, the free encyclopedia. A cervical collar, also known as a neck brace, is a medical device used to support a person's neck. It is also used by emergency personnel for those who have had traumatic head or neck injuries, and can be used to treat chronic medical conditions.
1. n. [Drilling] A component of a drillstring that provides weight on bit for drilling. Drill collars are thick-walled tubular pieces machined from solid bars of steel, usually plain carbon steel but sometimes of nonmagnetic nickel-copper alloy or other nonmagnetic premium alloys. The bars of steel are drilled from end to end to provide a passage to pumping drilling fluids through the collars. The outside diameter of the steel bars may be machined slightly to ensure roundness, and in some cases may be machined with helical grooves (spiral collars).