10pcs 12-76mm Plastic Tube Insert Plug Round Steel Pipe End Caps Non Slip Furniture Leg Decorative Dust Cover Floor Protector - Furniture Accessories - AliExpress
Machine Finish Aluminum Tube End Caps For 1-3/4 x 0.120 Wall Tubing Sold As A Pair - Kartek Off-Road
Great Value Pack Of 500 Postal Tube End Caps
19mm (3/4") Square Tube End Cap (ENDCPSQ19) - Richmond Wheel & Castor Co
Prescott Plastics 1" Inch (25.4 mm) Round Plastic Hole Plugs, Inserts, Black End Caps for Metal Tubing, Hardware Plug, Fences, Glide Protection from Chair Legs and Furniture - Pack of 4 - - Amazon.com
2" Square TUBING END Cap Plug - Quantity of 8: Amazon.com: Industrial & Scientific
Clear Tube End Caps - 2", Red S-6217 - Uline
Plastic Tube End Caps - Yellow | Scaffolding Supplies Limited