This bed rail set is for queen beds with head and foot boards. They’re made of high tensile steel and have double rivets that hold the end plates on. That’s important because if these are not strong the head and foot boards will move back and forth. These rails are approximately 80 1/2″ in length. These rails allow for a box spring and mattress to be used or you could even use bed slats in place of a box spring – we carry slats in our other listings! We also have these same rails for a full or twin size bed in our other listings!