The Norinco Type 85 tracked armoured fighting vehicle (industrial index: Type YW531H) is an improved version of the Type 63 APC vehicle. The vehicle is bigger, has additional firing ports and periscopes, a longer chassis with an additional road wheel on each side, and is equipped with an NBC protection system. The Type 85 series was developed in 1985, exclusively for the export market; for the PLA, the very similar Type 89 AFV was designed. The main user of the Type 85 series are the Royal Thai Armed Forces who received their first vehicles in 1987.