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Main image of Grover 502CK ROTO-GRIP Locking Rotomatics Guitar Tuners, Tuning Machines Set 3+3 18:1 Chrome Tuning Keys Tuner Heads Keystone Button with Dunlop Polish Cloth Bundle

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Grover 502CK ROTO-GRIP Locking Rotomatics Guitar Tuners, Tuning Machines Set 3+3 18:1 Chrome Tuning Keys Tuner Heads Keystone Button with Dunlop Polish Cloth Bundle

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Locking tuners for guitars. Designed for 3-left/3-right pegheads exclusively. Sealed-in, lubricated gear mechanism. 18:1 gear ratio. 25/64 post hole. Post length to hole: 23mm. Overall post length: 28.2mm. Hardware included (bushings, washers, screws). Drop-in replacement for: 102-18 Series, 102V Series, 103 Series, 106 Series, 109 Series, 109-18 Series, 135 Series (Top mounting hole will be visible), 136 Series (Top mounting hole will be visible), 502 Series, 509 Series

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Locking tuners for guitars. Designed for 3-left/3-right pegheads exclusively. Sealed-in, lubricated gear mechanism. 18:1 gear ratio. 25/64 post hole.
Post length to hole: 23mm.
Overall post length: 28.2 mm. Hardware included (bushings, washers, screws).
Drop-in replacement for: 102-18 Series, 102V Series, 103 Series, 106 Series, 109 Series, 109-18 Series, 135 Series (Top mounting hole will be visible), 136 Series (Top mounting hole will be visible), 502 Series, 509 Series

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First Listed on Newegg	July 30, 2026

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Item#: 9SIC80RM337543