3-1/2" Round Black Plastic Light Pole Top Cap Glass-Reinforced Polyester | Snap on Plugs for  Fencing, Flag Poles, Goal Posts, Mail Box 

Made in USA By Deltech Manufacturing

• Fits Round Poles with 3-1/2" Outside Diameter and 3" to 3-3/8" Inside Diameter

• Fits Round Poles with 3-1/2" Outside Diameter and 3" to 3-3/8" Inside Diameter

• Made from UV Stable Material

• Easy Installation