If you're looking to lock your fishing reels on your car roof, there are a few different ways that you can do so. One option is to use a standard padlock and chain. Simply loop the chain around the reel and through the holes in the padlock, then close it up. Another option is to use a cable lock. These work similarly to padlocks, but instead of using a chain, they use a thick cable. Once again, loop the cable around the reel and through the locking mechanism, then close it up. Finally, you could also use velcro straps or bungee cords. Just wrap these around the reel and secure them in place. Whichever method you choose, make sure that your reels are securely locked down so that they don't come loose while you're driving!