Features Multiple Sizes: This socket extension rod set has multiple sizes of extension rods to meet your different usage needs. Excellent chrome vanadium steel material: This drive nozzle extension rod sleeve is made of excellent chrome vanadium steel material, which is sturdy and wear-resistant, is not easily damaged and has a long life. 1/2" Connector: This drive sleeve extension rod sleeve features a 1/2" connector, which is very easy to install and very easy to use. Galvanizing treatment: This drive nozzle extension rod is galvanized to ensure smooth surface, not easy to erode and long life. Wide Application: This socket extension bar has a wide range of applications and can be used for ratchet drives and automotive repairs. Specification: Item Type: Socket Extension Bar Set Material: chrome vanadium steel Connection size: 1/2 inch Package list: 4x Extension poles Package List 4 x Extension Bars