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Molded of engineering grade non-metallic thermoplastic. Adjustable, no need to remove or relocate mounting screws to re-position the box. Slots retain slider plate and guide it in a straight motion. Inte4rnal rails guide slider plate for smooth mounting adjustability in wall substrates from 1/2 in. To 1-3/8 in. Thick and ceiling substrates from 1/2 in. To 1-5/32 in.
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