This set is made from SS304 and contains 1 large and 3 small actuators. These actuators are suitable for 4mm thick face faceplates and enclosure walls . The back of the actuator has a pin which can be ground down to the desired size. Simply drill an 8mm hole in your face plate for the large actuator and 4mm holes for the small.
Perfect for DNA C Boards
Here is an example mod made by Matt @ FyneMods using a 4mm small actuator set