Features: 16mm lamp post adapter connector, camera monitors cage photography accessory, commonly used for lamp poles. The inner diameter is up to16mm, with two 1/4"-20 mounting screws. Equipped with a knob, it can be manually fixed through the knob, making it convenient and fast. It is specifically designing to connect camera monitors to lamp posts, as well as a universal C standard bracket. The adapter connector can connection to the monitors cage backplate using two 1/4-20 screws. This connector is suitable for lamp posts that do not exceed 16 millimeters. Specifications: Material: Aluminum Alloy Color: black Size: approx. 47mm/1.85inch Package Includes: 1 Piece 16mm Light Tube Adapter with Wrench & Screws note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.