1. Material: steel 2. Features: ordinary 3. Standard: metric 4. Surface treatment: blackening 5. Strong locking force without slipping 6. Inner hexagon design, large torque 7. Integral heat treatment process, high hardness 8. Wear-resistant, durable, corrosion-resistant, not easy to rust 9. Scope of application: electric wrench, small jackhammer, large ratchet wrench, square socket interface
