This is a hulk hand with a 29.1mm diameter hole through it to slide onto a Yakima Rack load bar. The bottom has also been cut flat. This model serves no purpose other than something goofy to put on your racks. Coloring it is up to you. All credit goes to Doodle_Monkey for the original creation: https://www.thingiverse.com/thing:474091
It just fits on a Rep2 standing on end. Things got shaky near the top but it printed nicely.
The hole may be a little big or a little small depending on your printer, settings, filament, etc. Hard to know until you try. If it is too snug, try dipping it in HOT water for a few seconds to soften it.
Downloaded the original and imported into 123D Design. Boolean out the cylinder shape.