Kooren Shipbuilding and Trading B.V. declared their option for two 92.8 ft. (28.3 m) RT-60 class Rotor tugs to be built at ASL Shipyard in Singapore. The tugs will have a bollard pull capacity in excess of 65 metric tons each. Delivery of the tugs will be during the month of December 2005. Both tugs will be powered by three Wärtsilä 8L20 engines of 1440 kW each at 1000 rpm. The three azimuth thrusters will also come from Wärtsilä /Lips, they are of the FS200/2100 HR CP type. The tugs will be classed by Lloyds Register and will be equipped with firefighting capabilities of not less than 1,200 cbm/hr.
The main dimensions of the tug are as follows: