Hot-Roll Square Tube 3" x 3" x 11ga – Des Moines Steel Inc.
3 X 3, 11 gauge square tubing. holes on all 4 sides of the tube #laser #texas | By Lee Metal Fabrication | Facebook
Hydra 3 x 3 Inch Flat Foot Power Rack - Bells Of Steel USA
Signature Fitness 3” x 3” Wall Mounted Fold-in Power Cage Squat Rack with Adjustable Pull Up Bar and J Hooks - Space-Saving Home Gym, Red : Sports & Outdoors - Amazon.com