| CPC A63H 33/086 (2013.01) | 20 Claims |

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1. A construction set assembly comprising:
a metal construction element having a distal edge and a proximal recess adjacent to the distal edge; and
a plastic construction element having a wall and defining a nest opening configured to receive the metal construction element,
wherein the wall has an opening defining a cantilever member,
wherein the cantilever member has a first end joined integral with the plastic construction element and a second end that is opposite to the first end and is unsupported and deflectable relative to an initial position of the cantilever member,
wherein the second end has a hook protrusion protruding toward an interior of the nest opening, and
wherein to connect the metal construction element to the plastic construction element, at least a portion of the metal construction element is inserted into the nest opening such that the distal edge of the metal construction element contacts the hook protrusion, deflects the second end of the cantilever member away from the interior of the nest opening, and moves past the hook protrusion to allow the second end of the cantilever member to move back toward the interior of the nest opening to return to the initial position with the hook protrusion disposed in the proximal recess.
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