Interlocking tube

An interlocking tube and tube arrangement are provided. The tube includes an interior surface being adapted to allow placement of the object. The tube includes an exterior surface having a number of rails and a number of channels formed therein. Both the rails and channels have side surfaces that are back-cut. Portions of the rails and channels are cross-sectionally sized and shaped similarly to each other to permit a first tube to matingly engage a second, similar tube. The rails and channels extend between tube ends and are formed alternatingly about the tube exterior surface in an orientation parallel to the tube longitudinal axis. To engage the two tubes together, the rails of the first tube are slid into the correspondingly-sized channels of the second tube, their mutually back-cut side surfaces maintaining their engaged relationship. In one embodiment, the tubes are interlocked at angles of 90 degrees therebetween. In another embodiment, the tubes are interlocked at angles of 60 degrees therebetween.