Wash Bottles features: This iron support rings set comes with 3 retort rings, which can securely hold various sizes of bottles and instruments. Commonly used for chemical reactions and experiments in laboratories, factories, schools, hospitals, research, and so on. Features Color: Black, silver and blue Material: Iron Size: 19.50X10.00X2.00cm/7.66X3.93X0.79 inch This laboratory support ring is made of iron for durability The advantage of this laboratory closed iron support ring is acid and alkali resistance and oxidation resistance These laboratory support rings are very good laboratory assistants and are very practical This laboratory support ring is suitable for biological and chemical laboratory test beds to support a variety of beakers, flasks, etc Adopts precision production to stable characteristics and high reliability. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin