Adjustable socket wrench: Universal socket wrench easily handles high torques, firm and properly gripping any nuts and bolts within its adjustable size range, 10-19mm. Wide adjustability: Replaces sockets from 3/8" to 3/4" and 10 to 19 mm. Material: It is made from good quality steel, with high hardness, durable, sturdy. Good quality: Maintains even an equal force on all sides of fastener opposing rounded corners, it is durable to retract to the shape of most objects. Application: Adjusted immediately to grasp most nuts, screws, hooks, lag screws, bolt heads and others.