27 Pc. 1/2" Drive SAE & Metric Deep Master Set Flex socket design provides increased access to restricted fasteners. Manganese Phosphate coating provides superior corrosion resistance. High-visibility -etched markings provide quick size identification. Surface Drive technology virtually eliminates the rounding of fasteners. Chrome Molybdenum (CR-MO) alloy steel for exceptional strength and long lasting durability. Secondary Hard Stamped Markings provide long identification life. All GearWrench Impact Universal Sockets meet or exceed ASME B107.110 Specifications. Lifetime Warranty. Set includes:. 3/8”-15/16”. 10mm-19mm 84949N