... , 12, 18, 24, 30, 36 inches3.Standard depths of 3, 4, 5, and 6 inches4.Standard lengths of 10, 12, 20 and 24 ... installed to reduce field labor costs. Material: Q235 Steel (Chinese standard steel), SS304, SS316 & SS316L,FRP or GRP,Aluminium alloy • Electro ...