1. The outer diameter is 710mm and the inner diameter is 440mm

2. Iron blocks of not less than 14.5KG can be supported in fresh water for 12h

3. With a mass of not less than 0.75kg

Features: The product is produced according to THE requirements of IMO A.689(17), and its quality conforms to the 1983 Amendment of the International Convention for The Safety of Life at Sea of 1974 and MSC.81 (70).