337DC Trizact belts in grade A160 and size 675mm x 40mm are the best product for creating a consistent, satin grain finish over many metres of stainless steel handrail.
Use the Trizact A100 belts size 675 x 40 on the Cibo Finitube tube polisher (search: SMFT) to blend to a 280 grit grain finish.
For a final 320 grit satin finish, sand with a light touch action using the very fine surface conditioning belt ( search: VT RC3) after using the Trizact A160 belt.