This wire formed, epoxy coated holder to keep lead rings organized on your lab benchtop. You'll always have the size you need at hand. Flask weight ring holder features a circular base with a 7.5-Inch diameter. Rings with an inside diameter of 0.7-Inches or larger stack neatly on a tapered, 6.75-Inch height center post. Bel-Art® #: F183071000.