This ToolPRO Socket Extension Set comes with 3 pieces suited for 1/4, 3/8 and 1/2" drive ratchets and breaker bars. These extension bars are used to extend the reach of your socket wrench by your desired length. Easy to use, these steel bars are added between a wrench and the socket bit. Included in this package are 3 chrome vanadium steel socket extensions measuring 150mm and finished in high polish chrome plating for abrasion and rust resistance. These extensions are extremely useful when trying to reach a bolt housed in difficult to reach areas such as in an engine bay. Many items can be unreachable by hand and may require a modification such as this. This item is different from and not to be confused with a breaker bar, which extends the length of the wrench's handle while this extension adds length to the socket bit.