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Change over to Grover!Self aligning thrust bearings with special butterfly buttons. Durable cast housing. End thrust bearings. Worm meshes perfectly with gear. Safety-type string posts with cutaway shoulders to provide slip-over. Two screws in housing apron provide greater holding power. May be used with ALL modern bass guitar headpieces. Individually hand tested. Screws and bushings included.FeaturesColor: ChromeIncludes bushing and wood screws.2x2 (2 per side)Gear 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: 145C