rusty
why dont you give us a pic, sounds odd to me. I half wonder if theyre
corrugated fixings rather than nails. Scrwefix do those.
here's a picture (after long pause to charge camera batteries.). The fence
panel is just from the local Focus DIY.
http://mysite.wanadoo-members.co.uk/rustypage/nail.jpg
these items slice through the wood like butter and there seems to be
non-removal tag to stop them coming out.
rusty