Made From Chrome Molybdenum Alloy Steel (Cr-Mo) for Exceptional Strength and DurabilityOff-Corner Loading Design for Reduced Fastener RoundingManganese Phosphate Coating for Corrosion ResistanceParallel Neck Down Design On 8, 9, 10, 11, 12, 13 and 14mm Sizes for Improved Access to Restricted FastenersHigh-Visibility Laser Etched Markings for Quick Size IdentificationSecondary Hard StampingIncludes Blow Mold Case With Reinforced Steel Hinges and Steel Buckles for Strength and Security8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 & 19MM