 These boats were designated as Type 53A (53 Jia Xing, 53甲型), and a slightly modified version was designated as Type 54A (54 Jia Xing, 54甲型).They entered service in the 1950s and had been completely taken out of active service by the early 2000s and were transferred to law enforcement agencies.However, just like the Shantou, Beihai and Yulin classes that were transferred for law enforcement adaptation, these obsolete and aging boats are not satisfactory in their new roles due to their low maximum speed, sometime as low as 10 knots, which was not fast enough to catch the smugglers’ high speed motorboats.