In technician speak - panel switches
High quality Swiss panel switches typically used in professional electronic equipment
19.05mm x 19.05mm square
Normally open - momentary make
Maximum 48V @ 50mA switching current
Supplied with the clip on lens and diffuser
If illumination is required, this is usually from board mounted smd LED's (2.1mm height 120 degree)
Silent switch operation
In excess of 5 million switch operations lifetime
I can supply the complete engineering specifications for mounting details etc if required.
The button legend behind the lens and on top of the diffuser element is easily removeable/replaceable.
Australian suppliers have these on the market at around $8 per switch assembly