A 75 mm diameter circular metal disc with 12.5 mm central aperture. A screw controlled spring loaded precision slit is mounted on one side of the disc. Max opening 4 mm wide and 10-12 mm long.
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Optically worked, back silvered, with protective coating.
Diameter 25 mm, mounted in plastic eye-grip frame x 2.5 x 3 x 3.5 x 4
Rectangular, glass, back silvered, with protective coating
Wooden block 50 x 50 x 50 mm with slot to take rectangular mirrors.
75 mm long, 115 mm radii, 25 mm thickness
90 mm diameter,16 mm thickness
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