Machifit DC 5V 19mm 4 Pin Momentary Switch Led Light Metal Push Button Waterproof Switch
A part of the review has been auto-translated.
I ordered a couple of these switches to try them out. Arrived safely but no padding used in package. LED a nice blue colour. The retaining nut is quite loose on the thread so not a precision fit Measures 18.8mm diameter over the threads and 21.8mm diameter over front flange so your hole needs to be 19mm. The included O ring is enough to allow the nut to pull up on the threads. The button depresses just over 2mm and the led lense moves with the button giving a 15mm diameter for your finger to press. These switches were suitable for my project and I have ordered more.
Bought 4 to test them. They are amazing. Outstanding quality, really nice feel. Looks durable and pinout clearly indicated. Will soon buy a few dozens of them