1 Ounce Silver Bar Direct Fit Bulk Holder. Guardhouse Direct-Fit holders (capsules) are made of a virgin styrene acrylic polymer. This high quality material ensures long-term crystal clear clarity. The interior of the direct fit round coin capsule will hold an 1 oz. Bar snugly in a sealed chamber, but is also designed so that you can remove the contents if necessary. The exterior dimensions are measured to industry standards for coin boxes and holders.