===Nails===
[[Cable]] clip [[nail]]s are hardened, and usually go into
[[masonry]]. If getting them in proves impossible, [http://
http://www.cef.co.uk/catalogue/categ...ammerfix-range pin
plugs] may be used. These are little [[wallplug]]s designed for pins.
Or any type of resin [[glue]] can go into masonry [[Drill bit|holes]]
instead.

I suggest you add re importance of eye protection when hammering
hardened nails. You could x-ref
http://wiki.diyfaq.org.uk/index.php?...#Masonry_Nails but worth
saying something by way of warning for those of us who can't whack it
right first time, every time.
--
Robin
reply to address is (meant to be) valid