The popular and versatile park tool headset wrench features the proven ldquoyrdquo head design and all headset wrench openings are laser cut to ensure a tight accurate fit precise sizing is achieved by high voltage computer controlled laser technology after heat treat waiting until the wrench is heat treated eliminates shrinkage and expansion of the steel after the wrench is sized it takes longer and costs more but itrsquos worth the extra effort park tool headset wrench feat