#10 x 2-3/4" Simpson Strong-Tie DCU T20 Cap Head Composite Deck Screw - Quik Guard Coating, Tan 01, Pkg. 70 Simpson Deck Screws and the larger-diameter anchor holes

and the larger-diameter anchor holes are for 1/4"-diameter concrete screw anchors

The Simpson ECCQ48SDS2

Architectural Projects: Perfect for designs emphasizing exposed wood aesthetics without visible metal hardware

The silicone FIX-A-FLASH RoofjackSQ with a closed top was created for when a standard Roofjack will not work where there is an over-sized hole with a smaller diameter pipe

and coarse lower threads pull deck boards tightly to joists for a solid hold that lasts

#10 x 2-3/4" Simpson Strong-Tie DCU T20 Cap Head Composite Deck Screw - Quik Guard Coating, Tan 01, Pkg. 70 Simpson Deck Screws and the larger-diameter anchor holesThe 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 Guard coating provides dependable corrosion resistance for everything from residential decks to high exposure and marine environments. Built