Stanley 6-point 1/2" Drive Deep Well Impact Socket - 18mm 6 Point Impact Socket ideal for use on stubborn or damaged fasteners. Made from high alloy steel for greater strength, then heat treated to balance strength and hardness Max-Drive design, a unique radius corner design which provides 15% more torque 1/2" Drive / 6 Point / 18mm (metric) Impact Deep Length - Overall Length: 3-1/4"