This a generic mount for a 35mm top hat rail. This mount clamp snaps quite tight at the top hat rail and has a 10mm flat mounting base on top. You can easily attach different mounting cages to this base plate with glue. Update: I uploaded a version that can be click-mounted with my Raspberry Pi holder (http://www.thingiverse.com/thing:700900). The mounting base can be removed from the top hat rail by inserting a flat screwdriver at the bottom lug and gently bend him upwards. I'm going to upload several mounting cages for the raspberry pi etc. in the next time.