Simpson Strong-Tie APVB1010R Avant Decorative Post Base for 10x10 Rough Cut Posts - Black Powder Coat, ZMAXNotice This connector is designed for Rough Cut lumber NOT nominal lumber (most common). This will only fit a post that measures an actual 10x10". If you have a nominal post measuring 9 1 2" x 9 1 2" you will need an APVB1010 Decorative Post base Part of the Outdoor Accents Avant Collection, the APVB adjustable post base is designed to anchor wood posts to concrete while giving your build a clean, contemporary look without sacrificing durability.