Each vessel in the series is 22.8 meters long and 7.42 metres wide with a draft forward (bow) of 2.35 meters. 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 HP Kirloskar caterpillar engines, coupled to two steerable rudder propellers of 1,350 mm 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. 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.