Microscope Phase Contrast Rings 20mm Insertion Diameter

Description

You are bidding for a set of Phase Contrast Rings with following approx. dimensions.
Phase 1 : 2.50 mm centre stop diameter, 0.35mm width of light window.
Phase 2 : 3.75 mm centre stop diameter, 0.45mm width of light window.
Phase 3 : 5mm centre stop diameter, 0.8mm width of light window.
Phase 4 : 9.5mm centre stop diameter, 1.00mm width of light window.
Dark field : 14.5mm center stop diameter, 1.5mm with of light window.
Rings diameter approx. 20mm (-) designed to be inserted in a holder able to receive a 20mm diameter.
This units are made with close tolerance and a preliminary cleaning to eliminate some existing glue traces may be required. The units are not marked and the material used is Delrin.
Please look at the attached picture representing  the item you are bidding for.
Thank you for visiting and looking.