Apex square drive universal wrenches are made from a tougher and more ductile alloy steel which is then heat treated for extra durability. Hard-to-reach areas are no problem with the wide range of universal square drive universal wrenches from Apex Fastener Tools. Quality design and construction give Apex square drive universal wrenches a long service life and durability. Remember, square drive universal wrenches are not to be used with impact drivers.