Polishing Tri-ball handles

G'day, any ideas on how to polish these steel handles? Could a polishing drum be an option? No clue how it's done in a factory.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.