NZ1 turn to release emergency pushbutton 

head diameter: 30mm; base diameter: 21.7mm; with threaded ring (or without);

transparent window indication: red/yellow or red/green

NZ2 push pull emergency pushbutton

head diameter: 40mm base diameter: 25.1mm

NZ3 control station

Box: LAY5-BP03

Up button: NP2-BA3343 (two NO contacts)

Down button: NP2-BA3355 (one NC and one NO contact)

Emergency stop button: NP2-BS442 (30mm turn to release with one NC contact)

Connection: HC-M20*1.5 bend proof