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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Metal holder with sides grooved to hold lens up to 50 mm diameter on wooden support.
Wooden block 50 x 50 x 50 mm with slot to take rectangular mirrors.
Rectangular, clear, all sides polished
Diameter 25 mm, mounted in plastic eye-grip frame x 2.5 x 3 x 3.5 x 4
Sizes :
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