Each vessel in the series is 22.8 meters (74 ft 10 in) long and 7.42 meters (24 ft 4 in) wide with a draft forward (bow) of 2.35 meters (7 ft 9 in). Each tug has a capacity of 10 tonnes bollard pull at 85 per cent maximum continuous rating (MCR), speed of 12 knots at 85 per cent MCR and is fitted with two 850-horsepower (630-kilowatt) CaterpillarKirloskar engines, coupled to two steerable rudder propellers of 1,350 mm (53 in) diameter. The vessels have two auxiliary electrical generation plant of 60 kW each and are fitted with a sewage treatment plant. They have been designed by M/s Ska Marine, Chennai.[1] INS Arga and INS Bali are named after the coastal villages of Karwar District and both were inducted into the service by Rear Admiral Atul Kumar Jain.