... knock charcoal, good hardness, specific gravity:1.3-1.5, length:10-35 cm, diameter: 3.6 -3.8 cm, the ... knock charcoal, good hardness, specific gravity:1.1-1.2, length:8-35 cm, diameter: 3.5 -3.9 cm, the ... Carbonization CarbonizationMachine-made Charcoal in Stock(for export) 10-35cm Length Machine-made Charcoal/Sawdust Machine-made Charcoal