nd one male section of another embodiment of the instant invention; [0023]FIG. 8 is a cross-sectional view of one male section of the embodiment of FIG. 7 attached to a piece of material; [0024]FIGS. 9a and 9 b are a top view and a side cut-away view, respectively, of the magnetic ring of the embodiment, of FIG. 7; [0025]FIGS. 10a and 10 b are a top view and a side cut-away view, respectively, of