Carlisle Opticlean polypropylene open glass rack extender. Perfect for large cocktail glasses and delicate wine stems with oversize bowls. Compartment measures 4-7/16-inches by 4-7/16-inches. Accommodates glasses up to 4-3/16-inches in diameter. Inside height: 1.56-inches. Outside height: 1-3/4-inches. Measures length 19-3/4-inches by width 19-3/4-inches. NSF listed. Dishwasher safe. Polypropylene material. Blue color. Made in the USA.