Steel pin and tension washer construction for extra strength. No binding or locked joints. Wright flex handles have a 7 place indexing head for full 180 deg rotation. Forged and machined for best fit and unyielding strength. Precision heat-treated and tempered for optimal hardness, ductility and durability. Easy to read stamp pattern in order to quickly determine opening size. Meets or exceeds ASME B107.110. Made in the USA.