wrote in message
oups.com...
You want the plastic screw in anchors that are designed for drywall but
should work well with plaster. They are rated to hold 50lbs each in
drywall. Otherwise you would want to use a toggle bolt, as the nail
and clasp will fail unless you are talking about very small,
lightweight pictures.

I've used the plastic screw in anchors with success on plaster walls but
discovered you first have to drill a hole about the size of the anchor body
or the anchor will crumble and pull out the plaster instead of screwing into
the wall.
Tom.