JSP Manufacturing Fence Post Plastic Black Caps (2" X 2" Inside Dimension) (2 1/4" X 2 1/4" Outside Dimensions) 8 Pack New Fence Post Plastic Caps Black 8 Pack for 2x2 post Made In USA Great for any post Wood Metal or Vinyl post FC-2x2-BLACK-8pk-FBA The exact inside dimension is 2" x 2", the outside dimension are 2.20" x 2.20".