Type 10 Concrete BalustersPlain classic style Together with bottom rail the top rail stands at 41″. In order to meet the 4″ ball code this balustrade must be spaced 6.5″ center to center, (0.5″ apart) in other words 1.6 balusters per foot. Square part dimensions on top and bottom of these baluster are 6″x 6″, single baluster height is 31″ without the handrails. If no code is required in your area they can optionally be spaced at every 10″ for wider gaps.