Features and Benefits: Over 4-3/8″ bolt clearance depth; Made from high quality chrome-molybdenum steel; Heat treated for strength and durability; Size markings are hard stamped into the socket for easy identification; Black oxide coated for resistance against rust and corrosion; 1/2″ Drive x 7/16″ Extra-Deep Impact Socket. Our impact sockets grip the fastener across a broader contact area, reducing chance of rounding off fasteners. They also allow up to 20% more torque to be applied than on other impact sockets. The shift in pressure allows us to reduce the socket wall thickness, increasing access to tight areas.