39 Pc. 1/2" Drive 6 Point Standard & Deep Impact Metric Socket Set. Made From Chrome Molybdenum Alloy Steel (Cr-Mo) for Exceptional Strength and Durability. Off-Corner Loading Design for Reduced Fastener Rounding. Manganese Phosphate Coating for Corrosion Resistance. Parallel Neck Down Design On 9, 10, 11, 12, 13 and 14mm Standard and Deep Sizes for Improved Access to Restricted Fasteners. High-Visibility Laser Etched Markings for Quick Size Identification.