The Cal-Hawk extender set helps for access in hard to reach areas. Cal-Hawk offers the 4-piece Extension Bar set for 1/4 in.drive tools. The set includes a 3", 6", 9", and 12" extensions to ensure you get the job done. Cal-Hawk tools are made from carbon steel which is specially formulated and heat-treated for high strength and superior resistance to abrasion and corrosion. The extensions in this set feature radius corner driver design which reduces fastener rounding.