Specifications

used for sea-going ship and warships also couuld used for inland ship.
standarrd: ISO, GB,GB/T, CB etc

Kinds of type, as followig:

TYPE A/B

*LB (RB) BOLT FIXED LEFT (RIGHT) OPENING

*SB BOLT FIXED COMMON HINGED OPENING

*NB BOLT FIXED NON OPENING

*LE (RW) WELDED FIXED LEFT (RIGHT) OPENING

*SW WELDED FIXED COMMON HINGED OPENING

*NW WELDED FIXED NON OPENING

TYPE C

*LRB BOLT FIXED OPENING

*NB FIXED NON OPENING

*LRW WELDED FIXED OPENING

*NW WELED FIXED OPENING