Stainless Steel Rigid Handrail Support for 1-2/3″ Round Handrail E031/S1 Units are new and individually sealed. Quantity discount! A quality handrail support is essential to the safety and structural soundness of any railing system. The stainless steel handrail support suited for the 2/3″ diameter handrail tube offers just such security, while also allowing you to keep the clean polished look for the handrail system you are installing in your home or office space. The external diameter of the handrail support is 1/2″ and is made of 100% stainless steel for seamless matching, even as a replacement part for an existing stainless steel handrail.