High Quality Content by WIKIPEDIA articles! A wall plug or Rawlplug is a type of fixing used in building. It allows screws to be fitted into masonry walls.There are many forms of wall plug, but the most common principle is to use a tapered tube of soft material, such as plastic. This is inserted loosely into a drilled hole, then a screw is tightened into the centre. The screwing action wedges the plug firmly in place, the soft material conforming tightly to the masonry.