This is an unmounted, precision optical pinhole, laser cut in an aluminium metal shim. The thickness of the metal shim is 0.2mm (standard).
The aluminium substrate is as default 1 inch / 25.4 diameter, circular shape. Other sizes and shapes up to 2inch diameter or 2inch x 2inch rectangle are possible. Please contact us at firstname.lastname@example.org if you want a custom size at no extra cost.
Great for spectrometers, quasi-coherent light sources, spatial Fourier filters or other optics projects.