... and China's standard 4053-83. Matt stainless steel surface is in line with environmental requirements. Type IndicationI. Surface Treatment G: ... , other surface treatment is not marked.II. Plate: Needs plate, marks "A"; no plate, not marked.III. Quantity of horizontal pole: ... W, S, SC, SO, MB (Multi ball).2. Types of Inclined Railing include PA, CA, WA, SAL, SAR, AM, SOAL, SOAR. ball joint handrail