Our high precision slits and pinholes can be pre-mounted in black-anodized aluminum housing for a secure mechanical support. The mounts also fit into various optical assemblies. Mount can be clearly labeled with aperture/slit size for easy identification. Mounted slits and pinhole specification: Slit Widths Available: 5 1000 µm Slit Length: 3 mm or customized Slit Material: 304 Stainless Steel, or 304 Stainless Steel with Black Oxide Finish Housing: Black-Anodized Aluminum with (25.4mm) Outer Diameter x 0.10 (2.5mm)Thick Unmounted Slit Diameter: 9.5 mm Pinholes are available: 5um-1000um Unmounted slits or unmounted pinholes are also available. The slits or pinholes can be taken out of their housings by removing the retaining ring.