Features Multiple Sizes: This drive socket extension rod set features multiple sizes of extension rods that can meet your different usage needs. Excellent Chrome Vanadium Steel Material: This drive sleeve extension rod sleeve is made of excellent chrome vanadium steel material, which is sturdy and wear resistant, not easy to be damaged, and has a long service life. 1/2 Inch Connection: This drive sleeve extension rod sleeve features a 1/2 inch connection, which is very simple to install and very easy to use. Electroplating Treatment: This drive sleeve extension rod is electroplated for sleek surface, not easy to erode, and long service life. Wide Application: This drive socket extension bar has a wide range of applications and can be used for ratchet drives and automotive repairs. Specification: Item Type: Drive Socket Extension Bar Set Material: Chrome Vanadium Steel Connector Size: 1/2 Inch Package List:4 x Extension Bars Package List 4 x Extension Bars