Park aws 1 hex wrench set 4 5 6mm park tool introduced the bicycle industry to the 3 way hex wrench set more than 20 years ago our latest versions are stronger and more comfortable than ever they fit perfectly in the palm of the hand and provide tremendous leverage 4mm 5mm and 6mm hex set made from bondhus protanium high torque industrial steel heat treated for long life chamfered tips for a perfect fit