Round wooden fence post caps are both decorative and protective, preventing decay of the elements. This fence post cap ideas can finish the style of fences, lamp posts, mailbox posts and deck railings. Wood fence post cap ideas play an important role – it divert water and snow from causing the end grains of your posts to split and decay. In the store you can find different color and shapes of it. You can choose any size if you want, such as 3x3 or wood fence post caps 6x6.