This is the Oxygen Head Ring Flame (830-1483) which is a metal melting head (oxygen), ring shaped flame for use with the Swiss Torch (not included, see our 8301482). 

The Swiss Torch is the best-selling jeweler's torch in Europe.  This versatile and reliable lightweight torch has interchangeable heads for precision light work to casting to larger flames for melting. Use it with propane or natural gas. Not for use with ACETYLENE. The standard torch comes with standard head with three nozzles of graduating tip sizes, each produces a strong and pointed flame. The head features two handy dials (for fuel and oxygen) at the top of the torch where your thumb can easily reach both for tight control and on-the-fly flame adjustments. Made in Switzerland.