These Nickel Plated Steel Screws are a direct replacement for the vintage style 6 screw stratocaster tremolo bridge.   They can be used on made in Mexico/America/Custom Shop/Master Built stratocasters along with any aftermarket S-Style guitar that uses a vintage 6 screw tremolo assembly.   These are nickel plated screws so they are easy to relic/age to fit what ever your guitar finish needs are.