9 Piece Deep Socket Set, 3/8-in; 7/16-in; 1/2-in; 9/16-in; 5/8-in; 11/16-in; 3/4-in; 13/16-in; 7/8-in Patented Wright Drive distributes contact over a larger surface area for greater gripping power and strength Forged and machined for best fit and unyielding strength Precision heat-treated and tempered for optimal hardness, ductility and durability Easy