1. Material: carbon steel
2. Wrench interface: 1/2 inch (12.5mm)
3. 10-piece set with curved rod: 8/10/12/13/14/17/19/22/24mm
4. 10-piece set: 8/10/12/13/14/15/17/19/22/24mm
5. 15-piece set: 8/10/12/13/14/15/16/17/19/21/22/24/27/30/32mm
6. 20-piece set: 8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24/27/30/32mm
7. Box size: 10-piece set is about 29x10.5x5 cm, 15-piece set is about 26.5x21x5.5 cm, 20-piece set is about 34x26x7.5 cm
8. Overall weight: 10 piece set is about 1600 grams, 15 piece set is about 3000 grams, 20 piece set is about 4000 grams

Features:
1. 1/2 inch (12.5mm) interface, equipped with anti-drop bolt hole and rubber band groove, safe and practical
2. High carbon steel forging, high hardness, sturdiness and durability, overall heat treatment, impact resistance, strong torque
3. Hexagonal screw interface, concave groove design, cutting pier forming process, large contact surface and more slip-resistant
4. After secondary heat treatment, carbon black is phosphated to prevent rust
5. Complete specifications, easy to use, boxed storage, easy to carry