[High quality aftermarket 0.335 tip driver adapter compatible with Mizuno ST-X 220 ST-Z 220ST200 ST190 ST180 "Made by 7075 AIRCRAFT ALUMINUM. 6.9 gram wont change the parament setting of your driver head" INSIDE THREAD makes stronger connection to shaft and adapter 1 sleeve 1 screw 1 non-slip metal washer 1 rubber washer in the package Right Hand markings (still works with LH heads but markings are opposite)]