RadianceRail Post Caps add a stately feel to post sleeves with their subtly layered pyramid tops. The 5-1/16" opening is the perfect fit for TimberTech RadianceRail Post Sleeves, and no installation hardware is needed. To light up your outdoor living space, consider purchasing LED Post Light Modules for an elegant band of light between the post cap and the post. RadianceRail Post Caps are available in five great finishes to enhance any decor.