2-28mm Brass Reamer - Griffin Glass Tools
Griffin Glass Tools are renowned for their quality and durability, and this brass reamer is no exception. The octagonal shape allows air to flow in and out of your piece while you're reaming. Another advantage to the shape is that spinning it in hot glass helps create a perfect circle. The taper starts at 2mm and widens to 28mm over the course of 2.25". And it's made of brass, which means it will last. Don't forget the beeswax.