Abstract: A security attachment comprising a channel iron having imbedded or attached protruding and slightly angled vertical spokes attached to the outer top surface of said channel iron. The security attachment is used in conjunction with, preferably, a chain link fence to present a formidable barrier to potential intruders and also display a visually pleasing symmetrical arrangement along the top of the fence. The channel iron of the security attachment comprises an inverted u-shaped cross section, thereby providing a means for securely attaching the interior of the channel iron onto the top rail of a chain link, or similar fence. The device provides a substantial measure of additional fence security.