Fixing nail for insulation panels - has head encased in plastics sleeve with disc head and thread

摘要

The nail has a lower portion which has a fine pitch thread (11) over its length and a point (14). The nail also has an opposite handed coarse pitch thread (112) over the same surface. The remainder of the nail is cylindrical and plain. The nail has a head (13) enclosed in a plastics sleeve (2) with a tapered base (21) and a large diameter circular head (3).