Handles for GoPro to make it easier to use unmounted. Both have a small hoop for attaching a lanyard/wriststrap.
Prints fine without support or raft on my Rep 2, your milage may vary. Printed with custom profile at 340 micron, 3 shells and 10% hexagonal infill. The nut-insert is a bit tight, 30 seconds of scraping with something sharp should fix that. I like it this way, less chance of the nut falling out.
GoPro_Handle2.STL is with the slip-guard.
Update January 19th 2015: If you want to print this without support you will need to rotate the part to lay flat along the front face. If you look at the pictures you'll see the side where the GoPro-lens is facing is the side that should lay flat on the bed. My CAD-software has a different opinion about what is "up" than Makerware.