Fixing Device having three parallel threads of equal height

摘要

A fixing device for fixing to timber, plastics materials and friable substrates comprises a shank 1 having helically extending first, second and third parallel threads 5, 6, 7. The threads 5, 6, 7 are upstanding from the shank 1 and are in spaced apart arrangement to each other and extend to an equal height above the shank 1.