Using the Rothenberger Romax 4000 press jaws set is easy. First, make sure your press machine has an axial thrust of 32 - 34 kN. Then, select the appropriate jaw size (M15, M22, M28, or M35) for your fitting. Attach the jaw to the press machine correctly. When pressing, apply even pressure. For best results, keep the work area clean. As for maintenance, after each use, wipe the jaws clean to remove any debris. Check for signs of wear regularly. If you notice excessive wear or damage, replace the jaws. Also, store the jaws in a dry place to prevent corrosion. With proper use and care, these press jaws will serve you well for a long time.