My experience with them is nothing more than reading the <a href="http://www.cmi-gear.com/catalog/pulleys/pullspecs.asp?partnum=rp140" target="_blank">rp140 web page</a><blockquote>Continuous sideplate allows multiple rigging options--<i>parallel to the rope</i> with a single oval carabiner, or <i>perpendicular through the rigging holes</i>.</blockquote>(emphasis mine)