Brian Redd Reviews the Swivel Ball Adapter:

This adapter threads into the back of all Ape Labs Coins as well as M6 editions of Cans (replacement M6 bottom plates can be purchased for pre-M6 versions of Cans).

This adapter is used to hang your Can or Coin from any metal surface and lock in any angle within 540 degrees of freedom. The magnet has a holding force of 17.6lbs.
Weight: .66lbs
Size: 2.2 x 1.3 x 1.8 inches