Hex Keys, Screwdrivers & Wrenches - BALLDRIVER 6.0MM L-WRENC Ball End : A ball ended hex key has a straight shaft where the tip is in the shape of a ball with the hex pattern on it. This ball makes it easier to slip this kind of key into a hex head socket screw on an angle. of up to 25°. Hex End: A hex ended hex key has a straight shaft all the way to the tip. This kind of hex key can only be inserted into a hex head socket screw at a 90° angle.