Forged in the USA from select US alloy steel to withstand high-leverage and heavy loads Extra heavy-duty head area gives maximum strength and durability Nominal Opening: 1-1/8-Inch (28.6 mm) Catalog number, bolt size and nominal opening size are stamped on every wrench for easy identification 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 American Bridge design