The decorative fastener includes a base fitted with eyes or receptacles on the underside of the base and one or two straps that protrude from the lower portion of the base underside and which are fitted with hooks on their exposed ends. The circuit arrangement enables the best possible reactive power compensation, that is, enables operation close to a cos \u03b8 of 1, in order to increase the overall efficiency of the arrangement or to achieve optimal energy savings. The at least one \u03b1-Al2O3 layer is deposited by chemical vapor deposition using reaction gases comprising H2, CO2, AlCl3 and X and optional additions of N2 and Ar, with X being gaseous H2S, SO2, HF, SF6 or combinations thereof.