A: The AOLITI Glass clip hardware also can get through the 150000 times Opening and closing testing report; When the shower hinges used in the 30000 time open and closeing testing, The door will be return back the original position not over 1 degree difference.We also have own the Brass Forging And Pressing Machine,Bathroom Fitting Hardware Salt Spray Testing machines and Shower Hinges opening and closing Quality Test Machine in the factory. So we can promise the quality.