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Each unit has four pins and four pinholes, one on each corner of the unit, with the pins and the holes on the top and bottom of the unit respectfully. These pins and pinholes allow for the units to click and stack, one on top of the other. | ||||
The sides of the units are designed with dove tails, male and female, which allow the units to connect horizontally. | ||||
The unit can be easily attached to any surface by using the holes provided on the back of each unit. | ||||
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(c) Tego Products cc 2008