For wood walls or ceillings, always using the coarse thread drywall screws, and for sheet metals or plasterwood walls, normally using fine threaded drywall screws or drywall tek screws(with a drilling point). Material: C1022 ,C1008,stainless steel. Head Type: Bugle head, Pan head and others. Recess Type: Phillips, Combination(+-), Square, Torx
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