Features: The AD-AB Chuck Adapter allows for seamlessly conversion between different chuck size, enhancing efficiency and versatility in your projects. From high strength alloy, this adapter is wear resistant and durability, with precise engineering ensuring stability and safety during use. For machining professional, and DIY enthusiasts reliabled tools for their tasks. Perfectly suited for use in lathe machining, factory production lines, and workshops, catering to diverse processing needs. Experience the convenience of quick change operations with this essential accessory, a must addition to any tool collection. Specifications: Item：AD-AB Adaptor Inner Diameter about 50mm/1.97in Component：Alloy For AD300PRO AD400pro Flash Head Mount Package Includes: 1PC AD-AB Adaptor note: Due to problem of lighting effect there might be tolerances in product, please understand. Please allow 0-2mm error due to manual measurement.