Ingersoll Rand SK4M7U 1/2-Inch 7 Piece Universal Metric Impact Socket Set Impact Grade Toughness designed for High Torque applications Chrome-molybdenum steel forged for high-strength durability Laser-etched size labeling enables easier identification to get the job done faster Electro-phosphate finish projects a sleeker look for higher visibility Backed by a Lifetime Warranty to provide peace of mind with proven reliability