Installing Architectural Balusters is easy. They simply attach to the 2x4 rails with four provided screws. Use a 2x4 as a guide to achieve a 3.5" opening from baluster to baluster. First attach rails to post and then attach balusters to rails. Use the diagram below for measurement specifications. They screw on like 2x2's.

When balusters are used for high level decking please check the required heights with your Building Inspector. This is a U.S. product and their regulations may be different to UK ones.