I am glad I opened this before giving as a gift. The manufacturer has quality control issues. The product that was delivered had only 3 of the 4 rails connected to the glass. The reason why the 4th rail was not connected is that there was no threading drilled in the "ball" for the screw to connect the rail to the glass. They did include the screw in the packaging but without the threads it is worthless. Very cheaply made with no quality inspection before shipping. This was an OBVIOUS defect.