#10 x 2-3/4" Simpson Strong-Tie DCU T20 Cap Head Composite Deck Screw - 316 Stainless Steel, Gray, Pkg. 70 Flat Head 410 Stainless Steel Concrete Screws Lumber Size: Intended for use

Lumber Size: Intended for use with 3-1/4x beams and 6x posts/columns and includes necessary SDS connector screws for quick installation

5" hole that is 10" deep

If you have a nominal post measuring 3-1/2x3-1/2" you will need an APVB44 Decorative Post base

(83) XLSH34B1414-RP83 #14 shouldered screws

General Wood-to-Wood Structural Connections: Ideal for various framing needs

#10 x 2-3/4" Simpson Strong-Tie DCU T20 Cap Head Composite Deck Screw - 316 Stainless Steel, Gray, Pkg. 70 Flat Head 410 Stainless Steel Concrete Screws Lumber Size: Intended for useThe 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