PBK-815 is a door release button with back box in size of 83Lx32Wx25H(mm),which is the most common and the most frequently used in the access control systems.
PBK-812 is a plastic door release button with size of L88xW88xH20(mm), which is the most common and the most frequently used because of easy installation.
YKS-850S is a stainless steel key switches in size of 86Lx86Wx20H(mm), which is the most common and the most frequently used in the access control systems.