Answer: Serpentine Belt Tensioner Wrench Guess the Tool #14 Champion: Don Bolin, technician at Wheaton Service Center in Wheaton, MD. Answer: Serpentine Belt Tensioner Wrench Winner: Don Bolin, technician at Wheaton Service Center in Wheaton, MD. You May Also Like Guess the Tool Contest #81 Guess the Tool Contest #80 Guess the Tool Contest #79 Guess the Tool Contest #78