1. Material: metal
2. Not easy to rust
3. Simple operation
4. Format: metric
5. Scope of application: household, watch repair
6. 55 models are equipped with 18 minions: 9 rounds, three triangles/squares/half circles, 12 minions for blue without handles: three for round/arc/square/half circles, blue with handles 12 minions: three round/arc/square/semi-circle
7. Unit weight: 55 models: 142.5g, blue without handle: 187.7g, blue with handle: 190.7g
8. Size: 55 models: 16.3x7.1x1.6cm, blue without handle: 13.9x7.2x1.3cm, blue with handle: 17.5x7.3x1.4cm
