Features and Benefits: Marked with part number and size for ease of use; Heat treated for durability; 3/8 in. drive accommodates a variety of applications; Made in Taiwan; The KTI22006 is a 3/8 in. drive, 6 in. socket extension. The extra length provides additional reach when attempting to tighten and loosen bolts in deep, difficult to access spaces. It is crafted from chrome vanadium steel for strength.