... convenient to install, sturdy, durable, maintenance Ball-connection handrailRijin handrail adopts ball-connection and surface treatment of hot-dipped ... = carbon steel; S=stainless steelVIII. Oter Ball-connected Handrail Railing Specification Table SizeOut Diameter of BallOut diameter of ... SO, MB (Multi ball).2. Types of Inclined Railing include PA, CA, WA, SAL, SAR, AM, SOAL, SOAR. ball joint handrail