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phosphate rock screw sand washer

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phosphate rock screw sand washer

Jul 17, 2017· Thedrywall screw, threaded its whole length to aid in installation, will have its steel length coated in zinc orphosphate. Thephosphate coating, which is black in appearance, is preferred, as it is the more rust-resistant. However, this does not sanction use in wet or exterior situations.

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