maybe half inch hole in the middle you can put them around cable up to that size - like a fiber or ethernet cable. The plastic flexes and they can be used outside. Who uses them and where do you get them from etc having hard time locating what I want. Like this - just need a little smaller http://www.safetysign.com/products/p29327/fiber-optic-cable-marker Scott Carullo Technical Operations Florida High Speed Internet (321) 205-1100 x102
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