ABU Adjustable Standoff Post Base The Simpson Strong-Tie ABU Adjustable Post Base is a heavy duty post base for attaching posts to concrete. ABU Adjustable Post Bases with Uplift have a built-in code compliant 1" standoff to keep post dry & rot-free, along with a slotted anchor hole for adjusting posts to the correct spot. Strong adjustable post base with increased uplift loads for earthquake or extreme wind situations. Simpson Strong-Tie ABU Adjustable Post Base: ZMAX Coated For Superior Corrosion Resistance Post Base For Wood Posts On Concrete Sizes For Nominal 4x4, 6x6, Or 8x8 Posts 16 Gauge Steel ABU44Z For Nominal 4" Posts ABU66Z For Nominal 6" Posts ABU88Z For Nominal 8" Posts Built-In 1" Standoff Prevents Rot At Bottom Of Post Slotted Anchor Hole For Adjustability Made In The USA IBC, IRC, City of Los Angeles, & Florida Building Code Compliant Covered By Simpson Strong-Tie Limited Warranty Check The Simpson Strong-Tie Website For Load Values & Code Reports