Bed rails are different than a traditional Hollywood bed frame. Here's how, if you have (bed) with wooden headboard with a wood foot board and it supports the weight of your mattress set you will need to purchase bed rails.
Generally side rails connect one of 2 ways: Bolt on with nuts & bolts or the side rails hook into vertical slots. Most (beds) that utilize bed side rails are made of wood. Below are some great supports systems take note that some offer added features like strong cross bars and added feet for very the best support money can buy.