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Flat head with nibs - self-countersinks for a flush
Positive Stop: Prevents over-threading for balanced
Self-drilling point for easy installation into heavy-gauge steel
Attaches to grouted concrete block and wood framing
#10 x 2-3/4" Simpson Strong-Tie DCU T20 Cap Head Composite Deck Screw - 316 Stainless Steel, Gray, Pkg. 1,750 Large Diameter Masonry Screws Flat head with nibs -The Simpson Strong Tie Deck Drive DCU Composite Screw is designed for composite and PVC decking, trim, and cladding where strength, clean finishes, and durability are a must. Featuring a cap head that prevents mushrooming, these screws ensure a smooth, professional look across all major composite brands. The Quik Guardcoated 316 stainless steel offers dependable corrosion resistance for everything from residential decks to high exposure and marine