An injection-molded anchor with a ribbed shank which resists "backing-out" after installation and longitudinal slits along the shaft which allows the anchor to expand when a screw is inserted. Plastic anchors are a more economical, light-duty part than steel hollow wall anchors. They can be used in sheetrock, plaster, brickwork, concrete or tile. The design of the collar allows plastic anchors to also be used in hollow materials. For use with self-tapping or wood screws.