Powerful Substancemail: Produced from search engine speed steel with quenching and smithing, this port increases hardness by 30% and extends tool durability by oneandhalf times, ideal for strong applications Firm Hold Planumberebog: Features a standard opening plan with strong clamping force to stop slipping, ensuring high concentricity and agreement with various automobile and mechanical repairs Multiple Measurements Availablemail: Covers measurements from 6mm to 30mm, accommodating different screws and couplings, excellent for professional technicians and enthusiasts Transportable Storage Planumberebog: Thin structure includes a polystyrene storage box for easy transport and organization, ideal for mobile work and frequent travel Against Oxidation Facemail: Dealt with lampblack phosphating, it resists oxidation and executes entering temperatures from 20℃ to 80℃, suitable for outdoor and humid conditions, Manufacturer: HZBB