These optical breadboards are offered for use in vacuum-environments. Our stainless steel breadboards are passivated and double bagged in a clean environment to eliminate contamination when transported into a cleanroom. Aluminum breadboards are unanodized and come either in a rectangular or circular form factor. Unlike our steel breadboards, aluminum breadboards must be cleaned before they can be used in vacuum. Breadboards with custom hole patterns, ports, and sizes can be ordered for your application.