The universal socket uses a professional drive design that allows you to work with different sizes of fasteners, metric or standard. It allows working with various shapes - hex and square fasteners, hooks, and even rusted and damaged nuts and bolts, just put the socket on the fastener and start working. Features: Unique design automatically adjusts to any size or shape, compact and easy to carry. A universal grip can be adjusted immediately to grip nuts, screws, hooks and bolt heads. Self-adjusts from 1/4 inch to 3/4 inch standard and 7 to 19 mm metric. Made of chrome-vanadium steel, practical for long life. Professional universal ratcheting socket set, comes with a 3/8" power drill adapter. Can be used in the automotive industry, household maintenance, manufacturing industry, etc. Specifications: Material: Chrome Vanadium Steel Plug Color: Black, Silver (Optional) Application: Standard 1/4 & ;quot;to 3/4" and Metric from 7mm to 19mm Plug Size: 51 * 25mm / 2.0 * 1.0in (L * D) Plug