Hi-Ball Glass, 6-1/2 oz., Safedge rim, heavy base, DIPLOMAT, (Top diameter 2.50", bottom diameter 1.75"). Libbey Hi-Ball Glass. With innovation as its cornerstone, Libbey quality, consistency, and exceptional customer service have become the standard in the industry. Libbey continues to invest in state-of-the-art production equipment and faster and more efficient manufacturing technologies, allowing it to create the most significant introductions in the foodservice and consumer markets.