... .4, specific weight accounting method for: length (m unit) x width (m unit) x thickness (hao m unit) x 1.2, namely to corresponding the breadth ... most commonly used for: 1.27 x 1.87 m, 1.25 x 2.48 m, 1.54 x 3.04 thickness of: 4,5 ... .4, specific weight accounting method for: length (m unit) x width (m unit) x thickness (hao m unit) x 1.2, namely to corresponding the breadth ...