Forged from select alloy steel to withstand high-leverage and heavy loads. Extra-heavy-duty head area gives maximum strength and durability. Continuous taper of handle makes lining-up bolt holes easy and works on a range of bolt and/or hole sizes without binding. Extra-large hub area works on larger diameter holes better than other wrenches. Catalog number, bolt size and nominal opening size are stamped on every wrench for easy identification. American Bridge design..