If you have a nominal post measuring 3-1/2x3-1/2" you will need an APVB44 Decorative Post base
With its specially designed sharp-point and unique box-threads
The smooth upper shank helps pull wood members together for solid
T-25 star drive - secure bit engagement reduces cam-out and extends tool life
A sharp Type 17 point drives cleanly without predrilling
#10 x 4" Simpson Strong-Tie Deck-Drive T25 DSV Wood Screw - Quik Guard Coating, Red, Pkg 350 Slotted Hex Blue Concrete Screws If you have a nominalSimpson Strong Tie Deck Drive DSV Wood Screws are a powerful, load rated fastening solution for preservative treated decking applications. Designed with a rimmed flat head and underhead nibs, making them perfect for wood deck boards. The shank is built to withstand the natural swelling and shrinkage of dimensional lumber, helping your deck stay secure season after season. Available in tan, red, and black Quik Guard corrosion resistant coatings, these