3/4" Drive Adaptors, 3/4 in (female square); 1/2 in (male square) drive, 2 1/8"

Designed for superior performance allowing for easy interchange of tools from one drive size to another. 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 and exceeds ASME B107 hand tool standards.