Sensei PRO 40.5-52mm Aluminum Step-Up Ring Projector & Presentation Lamps the PVC cards are 30

the PVC cards are 30 mil thick and CR-80 size for use in most card printers

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Sensei PRO 40.5-52mm Aluminum Step-Up Ring Projector & Presentation Lamps the PVC cards are 30Use 52mm Filters on 40. 5mm Lens Knurled Sides for Firmer Grip Matte Black Finish Minimizes Reflections Corrosion Resistant Hard Anodized Finish The Sensei PRO 40. 5 52mm Aluminum Step Up Ring permits the use of 52mm threaded filters on lenses with 40. 5mm filter threads. It has large side knurls to provide a more textured grip when mounting or removing it from a lens. This step up ring features a lightweight, aluminum alloy construction that has a