SMI galvonometers holder. relic from the 80's as used in high end scanning equipment. holds two SMI type-H galvo mirror assembllies allows for horizontal and vertical adjustment contains a heater element and four base mounting screws. These come in original packaging with adjustment tool. ***Note : shown with one SMI galvo mirror in place for illustration only - NO SMI galvo's included - see other listings *** These are superbly made (manufacturer TBC.)