These are Grover's Mini-locking Rotomatic tuners (406 series) - the same innovative engineering and classic design as the original Grover Rotomatics except with reduced housing size and buttons. These typically are designed for usage on instruments with 6-in-line tuning machine formats where spacing is limited or more clearance between tuning machines is desired.
Additional Product Information
Important Specs and Dimensions:
Post Height = 1 in. (25.4mm)
Post Diameter = 15/64 in. (6mm)
Peghole Requirement = 25/64 in. (10mm)
Mounting Screw Location = 8 O'clock
Collar Diameter = 25/64 in. (10mm)
Collar Height = 23/64 in. (9mm)
Gear Ratio = 18:1
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