The original and genuine Bigsby vibrato unit, Kalamazoo Series. Originally manufactured in the mid 1940's and to this day, the parts are still manufactured in the U.S.A. and then sent over to Korea for final assembly. Each unit is beautifully packed in genuine Bigsby packaging. The B5 model is used for flat top solid body electric guitars such as SG and Telecaster. It is often referred to as the "Horse Shoe" Bigsby. It comes complete with arm, 4 mounting screws to attach the unit to the front face of the guitar, and a spring to support the vibrato mechanism. It has a cast aluminum frame and nickel string anchor bar. 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. Please see the second product image to view a detailed measurement and information sheet for this Bigsby unit.