Square Paint Grade Columns are unprimed column shafts are simple yet unique in design to allow you to install in your project easily for your individualized product. Whether covering a small to larger post you have the ability, on your job site, to ensure complete accuracy and customization!SpecificationsThe column shaft is made from four ½” thick unprimed panels with a lock miter joint for easy glue assembly. >Photo Gallery >Capital & Base Options Options 6" column actual outside dimension of the shaft is 6” and the inside dimension is 5” square.8" column actual outside dimension of the shaft is 7 5/8” and the inside dimension is 6 5/8” square.10" column actual outside dimension of the shaft is 9 3/8” and the inside dimension is 8 1/4” square.12" column actual outside dimension of the shaft is 11 7/8” and the inside dimension is 10 3/8” square. NOTE: The actual Column Shaft is 95”, the capitol will add about 2” making the overall height slightly over 8 feet.