Erection wrench, 3/4'' Bolt, for U.S. regular nut with overall length 16-5/8'' (422 mm). head width: 2-1/2'' (64 mm), nominal opening: 1-1/8'' (29 mm) and taper diameter: 1'' (25 mm) to 1/4'' (6 mm). 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.