angled surface 17 a screw 61 is positioned over the clamp hole piece 31 in fig6 c the screw 61 is inserted in the screw hole 33 that penetrate through the cylindrical portion 47 of the clamp hole piece 31 the lower portion of the screw 61 is projected from the bottom end of the cylindrical portion 47 to engage with the speaker frame or speaker cabinet fig9 b and 9c the pressing surface 39 of the clamp hole piece 31 contacts the press surface 15 of the speaker grille 11 reference is now made to fig7 a 7d showing a structure of a cover member 91 incorporated in the speaker grille attachment system fig7 a is a plan view of the cover member 91 and fig7 b is a bottom view of the cover member 91 fig7 c is a perspective bottom view showing a part of the cover member 91 fig7 d is a cross sectional bottom view of the cover member 91 taken along the 7 d 7 d line of fig7 b in the preferred embodiment the cover member 91 has a generally ring like shape and is made of elastic material such as synthetic rubber the cover member 91 is used to cover.