Granite Stabilizer Bar Add-on is designed to reinforce your Granite Power Rack so that it will stay rigid and square under heavy loads. This is only recommended when you don't intend to securely bolt the Power Rack to the floor, this stabilizer will help keep the Power Rack square and confident during strength exercises.
We always recommend that you securely bolt your Power Rack to the floor. When you add this stabilizer to Power Rack that is bolted to the floor, you will likely never see any movement from your rack ever again. This Power Rack stabilizer is fully made in USA from 3x3" 11ga tubing, just like the uprights of the Power Rack themselves.