OTC 4645 Serpentine Belt Tool Reviewhttp://tinyurl.com/omk9kzl OTC 4645 Serpentine Belt Tool Fits tensioner pulleys with 13 mm to16 mm 18 mm hex or 3/8" and 1/2" square drivesFor hard to access tensioners there are 13 mm and 15 mm 12-point wrenches built into the handleAlso included are 13 mm 14 mm and 15 mm crows foot wrenchesOne year limited warranty