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Is the stated 21mm or 32mm depth the amount of usable space inside?

No. Those figures are the overall external depths of the boxes. The corresponding measured usable internal depths are approximately 18.5mm and 30mm.

Walls and internal mouldings inevitably consume some of the nominal depth; a plastic box has not yet discovered the trick of being thinner on the inside than the outside.

Answered by
Richard
Product & Technical Support · Data Cabinets Direct
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This answer applies to 10 products in the Surface Backbox White products range.

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Product image unavailable Original product context 32 mm Double-Gang White Surface Backbox SKU: DLX-C-BB-DG-32MM View product →

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