Close-up challenge

Ok. My go. A fairly common item.

7F485B61-3D5F-4696-A7BF-3434E4881D9B.jpeg
 
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I've got a jubilee type clip kit with a long length of that... ??

How wide's the field of view?
 
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Is it strapping/banding for retaining?

Or as ihnj asked, an air vent or some sort?
 
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