Powerful TorqueHeated treated premium chrome vanadium steel sockets provide superior torque for greater turning power. Drop-Forged for a long lifespan and Chrome plated for rust resistance. Round corner design increases the contact surface with a ratchet wrench to get a tighter connection. Precision BitsBits are made of S2 alloy steel for superior hardness and toughness that reduce wear-outs and ensure longevity. Sandblasting finish protects bits from rust and corrosion. Chamfered ends allow smooth insertion onto fasteners and reduce the damage to edges. Meets and exceeds all ANSI specifications. ConvenienceSizes stamped markings and color grooves for easy identification. Organized in plastic rail set for easy carry and storage. There is no need to rotate sockets left and right, which may cause damage to the plastic rail. It's recommended that you use one hand to hold the plastic rail and the other hand to pinch the bottom of the socket, apply force to the op