Features: Compatible with M42 lens to other bayonet mount adapters, enabling use of M39 lenses on various bayonet mount camera bodies. Ideal for mirrorless camera or lens installation, offering convenience and practicality. Constructed with high-quality aluminum alloy interior and a matte finish exterior. Sleek black design, compact and well-crafted. Specifications: Material: Aluminum Alloy Color: Black Compatible Lens: M39 lens Compatible Camera Interface: M42 mount Note: 1. Please allow 1-2 cm measurement variation due to manual measurement. Ensure you are comfortable with this before ordering. 2. Due to differences in monitor displays, the actual color of the item may vary from the image shown. Package Includes: 1 x Lens Adapter Ring