Dear all please note:

Chuck is on the atmospheric pressure to fixed on the wall，so the wall more stringent requirements， must be absolutelysmooth and no leakage of the wall can be installed， sowhen you buy must pay attention to check whether theirlocation to install can install suckers. If you want to installwall can not install suckers， can buy the shop assistantversion of KM2017 sucker， sucker assisted paste on the wall plate， the sucker is arranged in the auxiliary plate，solved.