This rail is secured by means of two long arms that slip under the mattress. It can be easily removed and disassembled into three pieces for storage. The clip-on nylon cords must be secured around the legs of the bed for safety. It is not to be used for children under the age of eight. Height above base 360mm (141/4″). Width of mattress arms 610mm (24″). Length of side rail 935mm (37″). Weight 2.3kg.