6 5 4 5 is a gallery primarily focused on the studio furniture designed and built by its owners: Craig Marcus (Marcus Studio) and Bill James (James Wood Works). The name of the gallery is derived from its street address (6545 Hamilton Ave) in Pittsburgh.

Marcus Studio was previously located on Penn Ave. in Pittsburgh's Strip District, where Craig also maintained a similar showroom called
DesignSpace Pittsburgh.

James Wood Works was previously located on Pittsburgh's North Side in R.J. Casey Industrial park. An ex-steel executive for National Steel, Bill has been perfecting his craft since starting this company in 1991.