Chrome finish vintage ABR style roller tune-o-matic guitar bridge on rosewood base. Stainless steel rollers. String spacing is 2-1/16"(52mm). Stud spacing is 2-15/16"(74mm). Stud insert diameter is 5/32"(4mm).  Base is 6"(152mm) x 9/16"(14mm) and has a slightly curved bottom.