Change over to Grover!The Grover “MINI” is lightweight, compact and durable for modern electric basses. Gear ratio is 20:1. Housing is specially machined to achieve the precise tolerance that prevents slippage and allows fine tuning. Sealed gear box has permanent lubrication that makes the MINI friction-free for life. Individually hand-tested. Screws and bushings included. FeaturesColor: ChromeIncludes bushing and wood screws.4-in-line configurationGear ratio: 20:1String Post Height: 1 1/3 in. (33.7mm)String Post Diameter: 33/64 in (13mm)Bushing O.D.: 21/32 in. (16.7mm)Bushing I.D.: 33/64 in. (13.2mm)Mounting Plate Length Top to Bottom: 1 37/64 in. (40.2mm)Mounting Screw Hole location at Bottom of Plate: 1/2 in. (13mm) apartString Post Location: 3/4 in. (19.1mm) from horizon line of bottomMounting Holes CenteredGrover Part Number: 144C4