From 5 aerators I could only two open to the universal key, by the short length of the essays I can not serve up some other though but would adjust the size (TT / STD) of the bathtub faucet aerators is inside deep. Also you get to diagonally built aerators not ran (Grohe Essence faucet). The key is not good in the hand. The material looks different than on the picture (matt not glossy), but is very robust, the two aerators I could open were already very calcified, but was not a problem. Too bad product would be a bit better thought out to be as a "universal" used.
