2-1/2 CCF 8-12 – CCF Series Plugs for Round  Tubing, to Fit Round Tube Size 2.500" x Wall Thickness (.165 – .109), 0.69" Length, Black LD-PE (99395066) 

• High Grade Plastic (LDPE). Fits tubing with outside diameter of 2-1/2"
• Suitable for Gorilla Lifts, Fitness Equipment End Caps. Fencing Post End Caps. Furniture gliding caps. Installs easily and securely.
• Durable thick head design Can be used for finishing tubing ends. Good for Thick gauge metals
• *WARNING*: These Round 2-1/2" outside diameter plugs are of8-12G is suitable for thick gauge metals and works for tube hole GRIP RANGE from 2.17 to 2.28" ID (internal diameter). Please check the suitability of the plugs before placing order. The Size 2-1/2" refers to the out side diameter of the top cap. we have other gauges for thin metal tubes, including 10-14 and 14-20. Check the ID before ordering.
• CAUTION: This plug is 8-12G and only suitable for very thick metal wall/Gauges. Please see the hole grip range (8-12Ga for ID 2.17 - 2.28"). If you need for ID GREATER than 2.28" - 14-20G. Read details and avoid returns.