GearWrench 80645 1/2-Inch drive 18 Millimeter 6 point deep socket. Socket has "Surface Drive" technology which helps prevent the rounding of fastener corners. Made with the highest quality hard tool steel. Sockets feature large hard stamped identification of size to make it easier to find the desired size. Double line around socket body differentiates SAE sockets from metric sockets. High polish nickel chrome finish for long tool life.