You'll find all the sizes and tools you need in this 18Pcs Impact Extension Socket Set! It can satisfy all of your tool requirements. It is constructed from chrome vanadium (CR-V) steel, which is an alloy steel that is known for its durability and resistance to wear and tear. These tools will help you to perform a variety of tasks, like changing tires on vehicles, tightening bolts and nuts on cars, etc. 

The Impact Extension Socket Set is designed for use with impact drivers and other power tools. The impact coupler is a device that helps in connecting the power tool with the sockets and the adapters, Impact driver has a square drive shaft that is used to connect this coupler to it. It comes with a heavy-duty blow-molded storage case, is easy to carry, and transport, and is safe to store.

Included:

• 8 pc extension bars in 1/4"; 3/8" & 1/2" Drive impact extension bar
• 4pc Impact socket adapter
• 3pc Impact universal joint: 1/4"Drive; 3/8"Drive; 1/2"Drive;
• 3 pc Impact coupler :1/4"Hex*1/4"Drive.; 1/4"Hex*3/8"Drive.; 5/16"Hex*1/2"Drive.