Single Arm Slewing Davit Type: SA21 S.W.L: 21KN Suitable Rescue ... ,GL,CCS,BV,LR,KR,DNV,RINA,NK Single Arm Slewing DavitThe Single Arm Slewing Boat/Raft Davit is mainly used for ... and to pull the steel wire so that the winch hammer can control boat/raft landing and stop; Likewise, crew can ...