Hex head sockets became more popular than square ones because they enabled fasteners to be tightened or loosened with smaller movements of a wrench. In more confined spaces, where objects may restrict the swinging movement of a wrench, this was a big advantage.
Venus Sockets are Forged from high grade Chrome Vanadium steel. Scientifically heat treated to give maximum strength and wear resistance, Chrome plating finish to enable rust prevention and good looks.