Affirmation: The product sleeve and connecting rod for separate bulk packaging issued, after receiving the goods need to combine their own matching. Specifications: 7-19mm sleeve + 3/8 steel ball conversion rod 1 Surface plating treatment 1/4 inch (7mm), 3/4 inch (19mm) switchable plug Product Features 1/4 inch to 3/8 inch (7mm to 19mm) Non-rusting Suitable for butterfly screw caps, hexagonal screw caps, square screw caps, eyebolt screw caps, hook screw caps, tension screws, square head screw caps, etc. within the sleeve size Material: Chrome Vanadium Steel About this item: The socket has wide adjustability, automatically adjusts to standard 1/4" to 3/4" and metric 7mm to 19mm screws. Self-adjusting repair socket for getting any size or shape of fasteners, instantly adjusts to grip hex nuts, hooks, eye and lag screws, bolt heads, and other various shape and size objects. Money and space saving, with this socket you dont need to constantly change between all kinds of tools and size. The extension shaft is flexible, bendable, rotatable at many different angles. It done the drilling in most of the small space, gaps without limitation. Make your installation work more flexible, comfortable and efficient. Covered by premium plastic casing to protect your hands from hurting and perfectly completes the work. The inner shaft made of durable metal materials, with wide adjustable angle.