The new square lens hood is specifically designed for Sigma 18-50 F2.8 DC DN and 56 F1.4 DC DN contemporary lenses. With a bayonet fastening mechanism, this hood is compatible with Sigma brand lenses and comes as a single unit from China. The square design allows for a sturdy and reliable construction, providing extra protection from glare and lens flare during photography. Perfect for photographers looking to enhance their shooting experience with a high-quality lens hood from Sigma.