The universal socket uses a professional drive design that allows you to work with different sizes of fasteners, whether metric or standard. It ensures to work with different shapes - hexagonal and square fasteners, hooks, and even rusted and damaged nuts and bolts, just put the socket on the fastener and go to work. Features: Unique design automatically adjusts to any size or shape, compact and easy to carry. A universal socket can be adjusted immediately to grasp the nuts, screws, hooks and bolt tops. Self-adjusts from 1/4 inch to 3/4 inch standard and 7mm to 19mm metric. Made of chrome-vanadium steel, practical for long service life. Professional universal ratchet socket set, comes with a 3/8" power drill adapter. Can be used in automotive industry, household maintenance, manufacturing industry, etc. Specifications: Material: chrome-vanadium steel Socket color: black, silver (optional) Application: standard 1/4" to 3/4" and metric 7mm to 19mm Socket size: 51 * 25mm / 2.0 * 1.0in (L