Steel: 6140CrV 44-48 HRC Nickel-plating A: 15 mm B: 18 mm Length: 215 mm The double-ended hinge wrench is a non-detachable version of a drive and extender with a hinged twelve-sided box head (180° angle tilt). It is designed for efficient use and transmission of significant force in hard-to-reach areas. Rotating the box head parallel to the wrench body allows for quick loosening and tightening of fasteners when no excessive force is required. You can also purchase a set of hinge wrenches.