Brick->Hollow Blocks->20′ GT-ASM18/20 18′ Asmolen Brick Dimensions (cm): 18x20x39/25 Weight (kg/piece): 5.30 Volume Weight (kg/m3): 461 Volume (pcs/m2): 13 Volume (m3): 87 1m3 Weight/m3: 461 1m2 Weight/m2: 66.25 Height of Apron (min): 25 cm