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Mechanically engineered to the most precise standards of excellence, with the classic look of vintage styling, Groverﾒs Vintage 533 locking series come with a ﾓthumb screwﾔ mechanism, which locks the string into place. Insert the string through the post hole, wrap around once, then lock by tightening with the thumb screw. Worm and gear are cut to mesh perfectly, thereby eliminating backlash and slippage. The housings are self-lubricating for a lifetime of trouble-free service. 15:1 gear ratio.533N: Nickel for 6 string with safety post, 3 Treble and 3 Bass, Set of 6.