Factory made in Southern California, the 7415 Hybrid is made to retrofit any flat bass body. The 7415 is the only 5 string "cam operated" bass tremolo in the world! This was the one that ripped through the 80"s like a wildfire and was all the rage during those glitzy big hair days. Dive bombing sank to a new level as bass players chose to take the low road to rock "n" roll stardom. All 7415 Hybrids come with everything you need to install them including an arm, mounting screws and allen wrench set. Routing is required.