Prescott Plastics 2" (50.8 mm) Square Plastic Hole Plugs, 2x2 Square Tubing Inserts, Black End Caps for Metal Tubing, Fences, Glide Protection from Chair Legs and Furniture (4 Pack), Plugs - Amazon Canada
Amazon.com: Hot Rolled Steel Square Tubing, ASTM A-36, 1" x 1", 0.065" Wall, 12" Length : Industrial & Scientific