Replacement clear bottom glass for Omega Rapid Shift type Glass negative carriers, including #423-322 - 35mm, #423-323 - 6x6cm, #423-324 - 6x9cm roll film, #423-325 - 6x9cm sheet film, and 423-327 - 4"x 5" sheet film. Clear and anti-Newton top glass is also available for these carriers.
For reference these glass are nominally 105.5mm x 129.5mm x 2.2mm thick (approx 4-5/32" x 5-3/32" x 3/32" thick).