Wall plug has circular nut fitted in central bore which tapers towards inside of plug, top sections of plug, which are separated by longitudinal slits, fitting against this and being spread as nut is screwed in to fasten plug in place

摘要

The wall plug (1) has a circular nut (2) fitted in the central bore. This tapers towards the inside of the plug and the top sections (5) of the plug, which are separated by longitudinal slits, fit against this and are spread as the nut is screwed in to fasten the plug in place.