That looks like a tool that helps to remove a sink faucet (the single handle type). I believe the skinny end unscrews the handle (the screw would be located under the plastic red/blue cover) and the half circle with the clamps fits onto the nut that holds the faucet assembly together with the sink.
2015 Keystone passport 2400BH (new rig)
2014 Jayco Swift 184BH (traded in)
2015 RAM 1500 Crew Cab 5.7L HEMI V8 3.55 gears