Everbilt 1/2 in. x 36 in. Plain Steel Round Tube with 1/16 in. Thick 801227 - The Home Depot
Prescott Plastics 1" Inch (25.4 mm) Round Plastic Hole Plugs, Inserts, Black End Caps for Metal Tubing, Hardware Plugs, Fences, Glide Protection from Chair Legs and Furniture - Pack of 10 - - Amazon.com
Everbilt 36 in. x 1/2 in. x 1/16 in. Aluminum Round Tube 801247 - The Home Depot
Round Tubing 3/8" OD x 47 7/8" long - 5 tubes per bndl