Schneider 24mm diameter plastic push-on type lens cap.
Metal 25mm x .5 pitch lens lock ring (jam nut) to secure lenses with 25mm diameter mounting thread to unthreaded enlarger or camera lensboards.
Metal 32.5mm x .5 pitch lens lock ring (jam nut) to secure lenses or #0 shutters with 32.5mm diameter mounting thread to unthreaded enlarger or camera lensboards.
G-claron 240mm f9.0 Lens for graphic arts, macrophotography, field photography, and enlarging applications.