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![20mm post collar - RHX](https://images.findtheneedle.co.uk/findtheneedle/companyimages/95cca096-fb44-49d5-9223-df0178f1e93e.jpg)
20mm post collar.
For rotary adjustment without altering height.
For more information on 20mm post collar - RHX talk to Opto Mechanics.co.uk
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