Mysterious ring

The magician shows a ring and a chain and has them checked. He takes them back and magically the ring will instantly tie on the chain. The audience won’t be able to repeat the trick!
 
• Objects are made of steel and can be controlled.
• Very easy to carry, and it can be worn as a normal chain with pendant.  
• The ring has a diameter of 5 cm and a thickness of 3 mm. The chain closed on itself, is 35 cm long.