''An improved version of a medium caliber twin gun mount equipped as the main armament of light cruisers and training cruisers.<br>The improved version of a naval weapon used on the seaplane sender "Nisshin", the "Katori-class" training cruisers "Katori" and "Kashima", and the light cruiser Yuubari.<br>While not fit for anti-aircraft combat, they are effective as anti-ship and coast bombardment weaponry.
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''An improved version of a medium caliber twin gun mount equipped as the main armament of light cruisers and training cruisers.<br>The improved version of a naval weapon used on the Katori-class training cruisers "Katori" and "Kashima", the light cruiser "Yuubari", and the seaplane sender "Nisshin".<br>While not fit for anti-aircraft combat, they are effective as anti-ship and coast bombardment weaponry.