This adaptor is a high-quality product from Ace Glass, with a total length of 8.5 inches. It is designed to fit both 45/50 and 24/40 sizes, making it a versatile addition to your glassware collection. The adaptor is made from durable materials and is built to last, ensuring that you can use it for years to come. It is perfect for use in a variety of lab settings. With its sleek design and reliable construction, this adaptor is a must-have for anyone who needs to connect glassware of different sizes.