This soldering iron tip from Choice stained glass measures 3/10" in diameter and is about 3 3/8" long. It is designed to replaced the heater (tip, element) on the Choice Stained Glass iron sold in my store.
This iron idles at between 900-1000 degrees. For best results, use with a rheostat. Some of the time, these come tinned in red; sometimes in silver. The're the same tips from the same manufacturer.