337DC Trizact belts in grade A65 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 A65 belts size 675 x 40 on the Cibo Finitube tube polisher (search: SMFT) to blend to a 320 / 360 grit finish.
Always finish with a light touch action using a very fine surface conditioning belt ( search: VT RC3) after using the Trizact A65 belt.