Canon E-49 Lens Cap Features: - Offers Protection to Front Lens Element - Fits Lenses with 49mm Filter Threads - Replacement Item for EF 50mm f/1.8 STM Specifications: Packaging Info: - Package Weight: 0.1 lb - Box Dimensions (LxWxH): 5.0 x 3.0 x 0.25'' The E-49 Lens Cap from Canon helps to protect the front lens element from dust, dirt, moisture, and other elements during travel and storage. It fits lenses with 49mm-diameter threads, and is offered here as a replacement for the cap originally included with the EF 50mm f/1.8 STM lens. What's in the box Canon E-49 Lens Cap