This official Fender Pure Vintage '60s Stratocaster Tremolo Arm Kit fits most right handed American Strat guitars. It has the '60s style bend in the arm (by the tip) and the screw in arm uses their standard 10-32 imperial thread used on Fender American guitars. Included is one '50s eggshell and one '60s vintage white tremolo arm tip/knob and also a Fender tremolo arm tension spring, this is placed in the arm hole in the bridge before screwing the tremolo arm in, the spring puts a little tension on the arm to stop it hanging loose, keeping it in the desired playing position.