Suitable for medium size vessels. Polyethylene case. The EM 230 model has been successfully tested by QinetiQ to ISO 8729, Ships Wheel Mark, SOLAS, RORC & ORC. Has also been adopted by the UK military forces and other throughout the world. Mast, Halyard or Deck bracket mount. Height: 610mm Width: 245mm Fixing Holes: 8mm Weight: 2.5kg Fixing Centres: 569mm