Abstract: A construction toy including a plurality of rectangular plastic links which may be joined together to form three dimensional models. The links are made of injection molded plastic in various lengths, but of uniform width and thickness "t". Rectangular slots of square cross section, extend through the links, centered between their edges. The cross sectional sides of the slots are equal in dimension to "t". A "T" shaped plastic connector having a head and threaded shank is used with a mating nut to connect two or more links together in different configurations. The connector head and the end of the shank attached to the head are of equal square cross section, with a side dimension also equal to "t". Some of the links also include a plurality of interconnected perforations through which either a plastic bolt or the shank of a "T" connector is inserted to join the links together at various points along their length.