Used in more bike shops worldwide than any other tool brand, Park Tool produces industrial-quality tools to withstand the rigors of daily service and repair. The Park Tool HXS-1. 2 Professional Hex Wrench Set ensures long-lasting use, maximum torque, and a precise fit for years to come. Constructed with Bondhus Protanium high torque steel, these hex wrenches won't round-off prematurely like cheaper grades of steel. Park Tool even engineered them with a balldriver tip on the longer arm for securely locking into those hard-to-reach bolts, with a straight tip on the shorter arm for maximum torque.