... 300,000 square meters, 500,000 square meters and so on, and its specification can be 666 × 500 × 80 (hollow and solid), ... 666 × 500 × 100 (hollow and solid), 666 × 500 × 120 (hollow and solid), 666 ... and its specification can be 666 × 500 × 80 (hollow and solid), 666 × 500 × 100 (hollow and solid), 666 × 500 × 120 (hollow and solid), 666 ...