1. Material: high carbon steel, powder metallurgy 2. Size: about 270x170x60 mm/set 3. Weight: about 2.9 kg/set 4. Scope of application: auto repair, mechanical repair, etc. 5. Features: beautiful and practical, high temperature quenching, not easy to rust, high hardness, good toughness, uniform force, strong and durable, wide application range, plastic box packaging, convenient storage and carrying 6. Contains:large expander: 2-1/8 to 3-1/2 (54-89 mm), medium expander: 1-1/2 to 2-1/2 (38-64 mm), small expander: 1-1/8 to 3-3/4 (29-44mm), rubber O-ring: a set of large, medium and small (5 pieces)
