... with annual quantity of 100,000 square meters, 150,000 square meters, 200,000 square meters, 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 ... ±2mm(three blocks equals 1 sqm wall surface) Thickness 80, 100, 120, 150, 180±0.5mm Level up degree: Two main ...