An assembly including a first elongated rail having a male snap member extending along its length, the male snap member having a groove extending along its length, and a second elongated rail having a female snap member extending along its length. The female snap member has a first leg and a second leg, the first leg including a foot. The male snap member is receivable between the first and second legs of the female snap member such that the foot of the female snap member is received in the groove of the male snap member to exert a force that retains the male and female snap members together such that the first and second rails are assembled to form a hollow tube.