Tremolo Arm 5mm For Squier/Mexican Instruments Tremolo arm with a metric thread normally used on Squier and most Mexican-made Fender Stratocaster's - 5mm diameter. This tremolo arm has also been confirmed as fitting the early 1980's Tokai ST50 Strat. For USA-made Fender Stratocaster or early 1980's JV Squier - see B1 tremolo arm.