Wall Hook
Wall Hook: a device at the bottom of an overshot for centering the upward looking end of pipe that may be laying against the casing. The hook may resemble a finger or strip of metal pointing clockwise and used with pipe rotation to surround and center the pipe.
Source: http://gekengineering.com/Downloads/Free_Downloads/Glossary_of_Petroleum_Engineering_Terms_25_August_2010.pdf
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Author of the text: George E. King Engineering
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