The Y Carrier Barn Door Kit (BH9BI & RH025) is available in the various finishes and is part of the Barn Door Kit Collection by Acorn. The base metal for finish 10-Brushed Stainless steel is solid stainless steel. The base metal for all other powder coat finishes is Iron. (Stainless Steel or Smooth Iron, Standard Duty, 450 lbs Door Limit)