Review on Universal Fence Top Cap For 4X4 Inches Post With Pyramid Shape - Screw-Free Design (Actual Size 3.5X3.5) - Color: Black - 1 Piece, From Myard PNP 115445 by John Ghattamaraju

These did the trick! They look nice, were really affordable and took me about 15 minutes to clip them together and secure them in place. I knocked off a star because the bottom half comes in a nice matte black finish, but the pyramid on top came in a high gloss black. They looked really weird so I just bought a can of matte black car spray paint and hit all the pyramids with that before clipping the pieces together. I specifically used "rustoleum matte finish custom shop black" for anyone that wants the exact match for the bottom half of the caps. All in All, these caps were half the price of the ones at home depot and the fact that I could just glue them in place made them idiot-proof to install. It turned out to be a nice little upgrade to our first home that I didn't need my husband or power tools for.