The invention relates to a mechanical fastener including a plurality of engaging stems located in arrangements, which repeat on a substrate. A preferred embodiment of the invention provides a mechanical fastener with a substrate and a plurality of engaging stems extending from said substrate. The stems are arranged in a plurality of repeating arrangements, wherein the stems within each of the arrangements are unordered. The fastener includes an x-axis and a y-axis which are mutually perpendicular to each other. The location of each of the engaging stems in the arrangements is ordered relative to one another along the y-axis. <IMAGE>
