For final rail height of 36"- use 29" or 31" balustersFor final rail height of 42"- use 31" or 35" balustersNote: final rail height will vary based on the gap between decking and the bottom railBalusters required per section 15 for 6', 20 for 8', 25 for 10'TimberTech RadianceRail Aluminum Balusters are one of the choices of infill for the RadianceRail Top and Bottom Custom Rail Pack. Smooth lines. No visible hardware. Both add to the high-end look of RadianceRail composite railing, TimberTech’s most sought-after railing product. Homeowners can mix and match differing post and rail colors.