The original and genuine Bigsby®, vibrato unit. Originally manufactured in the mid 1940's and is still being made in the U.S.A. today. The B12G model is used for solid body and thin acoustic or electric guitars. It comes complete with a gold plated arm, 3 mounting screws to attach the unit to the side of the guitar and a spring to support the vibrato mechanism. The aluminium unit is gold plated. Fitting instructions are included although we recommend a local guitar Luthier to fit it for you if you are unsure about carrying the work out yourself. It does not come with a bridge although you can order it separately.