Abstract: A vapor masking device useable during the execution of a metal vapor depositing technique in a vacuum for masking inner and outer peripheral regions of a disc. The device comprises a support plate having a mounting opening and an annular seat protruding a slight distance radially inwardly into the mounting opening for the support of a pair of spaced discs from below in contact with a lower member of the discs, at least one disc holder for holding the discs in spaced and concentric relation to each other, and a retainer assembly having at least one access opening and adapted to be mounted on the support plate while permitting an intermediate region of an upper member of the discs between the outer and inner peripheral regions thereof to be exposed to the outside through the access opening.