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What is a 'Collar'. A collar is a protective options strategy that is implemented after a long position in a stock has experienced substantial gains. An investor can create a collar position by purchasing an out-of-the-money put option while he simultaneously writes an out-of-the-money call option. A collar is also known as hedge wrapper.
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).