Jiangyin Yangfan Ship Trading Co.,Ltd is one of the best signal bells manufacturers and suppliers in China, you can get signal bells free sample and buy discount products from our factory.Made of cast brass with a highly polished finish. The size is determined by measuring the bell mouth opening. The required size is over 300 mm diameter for the vessels of length greater than 20 mtr.370101 02 03Bell,signal,cast brass 200 mm Bell,signal,cast brass 300 mm Bell,signal,cast brass 400 mmPc. Pc. Pc.