Since SeaSucker bike racks aren't bolted on to rooftop bars, you may ask "How do I keep my bikes from being stolen?" The answer is their patent-pending Cable Anchors. The Cable Anchor is just what it sounds like - an anchor point to securely connect a cable loop to your car.The Window Cable Anchor slides over the glass on either side window and rolls up into the window frame. Each is made of polished stainless steel and has a 1 3/8 hole to thread a cable lock through.