screw key

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Noun1.Screw key - a wrench for turning a screwscrew key - a wrench for turning a screw  
spanner, wrench - a hand tool that is used to hold or twist a nut or bolt
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Projects in the book include a warded lock with a key, a three-number combination lock, an antique lever lock with a key, a railroad switch lock with a key, an antique push key lever lock with a key, a push-button combination lock, a Chinese lock, a screw key lock, and a giant antique lever lock.
Use a 3/8-in socket-head screw key to remove both pipe screws on the barrel of the MRS.