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These rings replace the small black ring supplied with Centra rearsight iris units, and are designed to work in conjunction with the surrounding light in helping the shooter to look through the centre of the rearsight aperture. This set of large (or more correctly, thick) rings is intended for use with basic rearsight units that do not contain integrated colour filters, but allow Centra Individual Colour filters to be added to these units. The set consists of silver, green, red, yellow, blue & red rings.
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