What type of knockouts are on the concrete-mountable structured media enclosures? For example pn 48605-21E, 48605-28E, 48605-42E
On top and bottom of the enclosure there are 10 smaller concentric knockouts and 2 larger concentric knockouts. Each knockout can be broken out to one of two sizes:
1.375" and 1.125"
1.969" and 1.734"
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