Made of aluminum-bronze, these sockets satisfy OSHA requirements that specify nonsparking tools for locations where flammable vapors and combustible residues are present. With twice as many corners, 8-point sockets grab onto square-drive screws and nuts more quickly than 4-point sockets. Also known as double-square sockets. These sockets are sturdier and have more give than manual-drive sockets, so they'll withstand the high torque and force of impact tools. They can also be used with hand-drive tools.