To make the bin pull handles you emboss strips of lightweight metal in a solid mold. You can make a suitable mold from many materials, I used scrap polymer clay as it is a material many miniaturists have on hand. Dental plaster will also work.
To make the polymer clay bin pull mold you will need a flat circular object that equals roughly 5 inches in your scale, and a round ended object which is roughly equal to 3 inches in your scale. I used the lid of a tube of mechanical pencil erasers for my flat object, and the end of a wooden embossing tool for my rounded object.
To Make the Bin Pull Mold
Press the flat circular shape against a square of polymer clay at least 1/4 inch thick. You need to indent the clay by less than 1:32 of an inch (less than 1mm). Press the round ended object just in from the edge of your flat impression to set the shape of the bin pull into the mold. Most bin pulls are roughly 1 inch to 1 1/2 inches deep, so press your round object between 1/32 and 1/16 inches (1mm and 2mm) further into the polymer clay than you did your flat object. The deeper you insert your round ended object, the more round your pull will be shaped away from its backing.