I use a set of 1/2" 2 hole straps (U shaped metal loops used for securing electrical tubing to the side of a building - found @ Home Depot) screwed into the front of the rack shelves. I used 1 strap about 3/4 of the way up & 1 on the bottom shelf. I made sure to use a pair of pliers in order to bend the straps so they allowed more space for the bars to slide through. I then used 1/2" metal tubing (you could also use pvc pipe or wooden dowels as long as they are long enough) to slide through the straps and PRESTO!! Secure snakes! Hope this helps & wasn't too confusing.

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