Material: chrome-vanadium. & nbsp; sizes: 2-4 3/4 " (51-121mm) Adjustable wrench head, high torque, durable. Used on lever bolts, screws, nuts and more. Note: When choosing the wrench, measure the outside diameter of the round nut. Then you can choose a larger wrench to easily bend the nut. Size: Square Head, 2-4 3/4 Inch (51-121mm)