A plastic plug for anchoring objects in support structures comprises an expansible portion and an elongated neck having a head portion with a flange for supporting an object being secured to the support structure. The elongated neck is formed of two spaced expansible legs and has an elliptical cross-section which merges into circles at two end portions thereof. The expansible portions of the legs are provided with longitudinal grooves which form a widening of the longitudinal bore in the head portion.
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