Abstract: There is disclosed a pre-fabricated fence assembly which comprises a fence post having at least one rail accommodating slot. A rail is forced into the slot and is retained therein by means of a retainer clip which is secured to the rail and comprises a "D" shaped wedge member which is secured to the rail by means of two projections which are inserted into apertures in the rail prior to insertion of the composite rail and retainer member into the post aperture.The post, rail and retainer members are preferably fabricated from a durable plastic material such as vinyl to afford reliable and long use when the fence is emplaced at a desired location.