No photo or drawing of this product that I have seen shows that it is open at both ends. It seems like it's important to know. The box is designed for heavy-duty applications and is equipped with a cable entry at one end (hanging version). Be sure to purchase a blind end if you only plan to use one side. Here's a useful photo, not like the standard ones that for some reason hide the second opening. I used this to hold some knobs for a faucet control pendant and the box inside is pretty tight.
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