Features: < Material: It is made of good quality steel, with high hardness, durable, sturdy. < Adjustable Socket Wrench: Universal socket wrench easily handles high torques, holds firmly and properly any nuts and bolts within its adjustable size range, 10-19mm < Good Quality: Maintains even equal strength on all sides of fastener opposite rounded corners, durable to shrink back to shape most objects. < Wide Adjustability: Replaces 3/8" to 3/4" and 10 to 19mm sockets < Application: Adjusts immediately to hold most of nuts, bolts, hooks, lag bolts, bolt heads, and more.