13 Pc. 3/8" Drive Deep Metric Impact Socket Set Made from Chrome Molybdenum Alloy Steel (CR-MO) for exceptional strength and durability. Surface Drive Technology for reduced fastener rounding. Manganese Phosphate coating for corrosion resistance. Parallel Neck Down Design on 8, 9, 10, 11mm sizes for improved access to restricted fasteners. High-Visibility etched markings for quick size identification. Secondary Hard Stamping. Set includes:. GearWrench socket clip rail. Deep Metric Impact Sockets from 8mm to 21mm 84914NP