A retort ring with boss head M.S. is a laboratory apparatus used to hold and support a retort, which is a glassware vessel with a long, curved neck, during a chemical experiment. The retort ring is made of mild steel and is shaped like a circular ring with an attached boss head.

The boss head has a clamp that can be tightened or loosened to secure the ring to a laboratory stand or support rod. The retort can then be placed inside the ring and held securely in place during the experiment.

The retort ring with boss head M.S. is commonly used in chemistry and biology experiments where a retort is used as a reaction vessel or distillation apparatus. The mild steel construction of the retort ring provides durability and strength, making it suitable for use in a laboratory setting.