10 Pack: 2" Square Black Plastic Plug, for ID 1.74" to 1.83" - 10 - 14 Ga Tubing End Cap, Furniture Chair Glide Inserts ' Fencing Post End Inserts ' by SBD
10 Pack: (0.75" (3/4"), 14-20 Ga) Square Black Plastic Plug, (ID Hole Size 0.6" to 0.67") Tubing End Cap, Furniture Chair Glide Inserts ' Fencing Post End Inserts ' by SBD