These are Steady Eddies. 

If you ride with flat bars then Steady Eddies are a great piece of kit. These little fellas stablise your bike while it's upside down. They are small enough to be taken out on the trail and used incase of punctures, pad fail, gear problems, etc.

When needed, they clip onto your bar grips, one each side, facing the sky. Now turn your bike upside down, and bingo, your bike is stable.

Steady Eddies are great in protecting a bar mounted lamp, a bar mounted GPS unit and bar mounted fork pop lock triggers from hitting the ground when you upturn your bike for minor repairs while out in the wilds.

 

Steady Eddies are sold in pairs.