... S means standard type; E means economical type. Please see Railing Specification Table below. VII. Materials: C = carbon steel; ... S=stainless steelVIII. Oter Ball-connected Handrail Railing Specification Table SizeOut Diameter of BallOut diameter of pillarOut diameter ... SC, SO, MB (Multi ball).2. Types of Inclined Railing include PA, CA, WA, SAL, SAR, AM, SOAL, SOAR. aluminum hand railing