GOTOH® 510TS SF Steel Block Tremolo. With precisely machined, heat-treated steel knife edges and top plates, it's built for durability and smooth performance and ensures long life with low wear for years of hassle-free rocking. Perfect for USA vintage spec Stratocasters® and other guitars with 6-pivot screw mounting tremolo and 2-7/32" (56mm) screw spacing. Includes bridge mounting screws, springs, tremolo claw & tremolo arm.