Durability: Made from Hardened treated Chrome Vanadium steel alloy (Cr-V). Telescoping handle extends to 19 inches for maximum leverage. Compacts to 13 inches for easy storage. 1/2" Drive Head: 17mm, 19mm(3/4"), 21mm(13/16"), 22mm(7/8") socket sizes provided. Easy Storage: A convenient carry bag is included for storage.