1、2.0mm-100mm (10) in this option is equivalent to graphite rods with a diameter of 2.0mm, a length of 100mm and a quantity of 10. Other specifications in the option have the same meaning.

2、3.0mm-300mm (10) in this option is equivalent to graphite rods with a diameter of 3.0mm, a length of 300mm and a quantity of 10. Other specifications in the option have the same meaning.