JZTG Band Steel Casing Items Foundation Piling Construction Industry Drilling casing date list is as below: D1/D2 mm length(m) a1(m) a2(m) a3(m) 2 3 4 ...
JZTG Band Steel Casing Items Foundation Piling Construction Industry Drilling casing date list is as below: D1/D2 mm length(m) a1(m) a2(m) a3(m) 2 3 4 ...