1 1/2" Dr. Impact Adaptors, 1 1/2" (female sq); 1" (male square) drive, 4 5/16"

Designed for superior performance permitting easy interchange of tools from one drive size to another. Oiled black oxide finish. 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.