UNIVERSAL TOOL: This unique and robust design allows the spanner to self-adjust on any shaped nut whether its a hex nut, wing nut, lag bolts, tensions screws. You can tighten or loosen any fastener that is within the size of this particular wrench. It doesnt matter what shape the nut is. PROFESSIONAL TOOL: This universal socket spanner can fit standard 1/4 to 3/4-inch and metric 7-19mm nuts and bolt heads. There are 2 pcs in the box one is the universal wrench and other is a connector/adaptor to use spanner with a power drill. HIGH QUALITY MATERIAL: High strength all solid, high strength chrome vanadium steel tubing stainless steel columns provide you with reliable and durable tools for efficient applications and convenient applications. Its high strength makes it the suitable tools for tightening and loosening nuts and bolts PORTABLE: This universal wrench with compact design and lightweight allows you to carry it with you instead of carrying a set of different size wrenches for the same job this one spanner can do in a finer way. MULTILATERAL: High quality chrome vanadium forging, this spanner is internally constituted with 54 high-carbon steel spring pins which retracts to fit the shape of the fastener. High hardness, durable spring quality and an anti-rust tool all for achieving longer time span with good quality.