Abstract: An expansion band is provided with a row of metallic bottom links underlying a row of metallic top links. The top links are offset with respect to the bottom links in the direction of the band length, with metallic top shells mounted on the top links. Metallic spring biased connecting elements mechanically couple the top and bottom links in a manner permitting resilient longitudinal adjustment of the band between a contracted state at which the top shells are in mutual abutting relationship to thereby cover the underlying upper surfaces of the bottom links, and an extended state at which the top shells are spaced on from the other to thereby expose the upper surfaces of the bottom links. Only the top shells having a base coating of black oxide, and only the to shells having a base coating of black oxide, and only the exposed exterior surfaces of the thus coated top shells and the upper surfaces of the bottom links have a polymeric coating.

Abstract: A snap fastener including a conventional first headed part and a second receptor part. The receptor is of sheet-like construction and includes a planar spring panel captured within a housing. The spring panel includes a central cut-out into which fingers extend from opposite sides to form an undersized opening which upon contact with the stud distorts the spring panel to provide the desired closing action therewith.