... drawings carbon steel heat treatment The above double bitt marine deck bollard is design and produced as per our domestic shipping ... .Material:Aluminium, Brass, Carbon steel, Stainless steel, Alloy metal & etc. Equipment:CNC lathe, processing center, miller, grinder, punching machine & etc. Tel ... -411-82778268Fax:0086-411-82778368Attn:Mr. Alex/ Ms. Sophia marine deck bollard