These are O rings which are formed by bending stock wire into the correct shape, and then applying a weld to the point where they join. The rich black finish is applied after that process is complete. This differs from cast rings, which are poured as molten metal into a mold, and the resulting product is without a weld, and one solid piece. The welded wire rings (these) are by far both the most common, and the least expensive. These are shiny black, not gunmetal (dull) black, and have a beautiful sheen! These have a myriad of uses, in leather, fashion, and industrial trades. We provide 2 measurements, the first, in inches, is the inner diameter of the ring. The second is the thickness, in millimeters, of the material itself. |