Since SeaSucker bike racks aren't bolted on to rooftop bars, we are often asked "How do you keep your bikes from being stolen?" The answer is our Cable Anchor. The Cable Anchor is just that - an anchor point to securely connect your cable loop to your car. The Cable Anchor - Trunk closes inside your truck or door. It's made of polished stainless steel and has a 1 3/8 hole to thread your cable or lock through.