On Mon, 07 Sep 2009 23:57:49 +0100, John Rumm
wrote:

Its quite handy when you want to weight something down - say when
assembling and gluing stuff. Or the other day I was jigsawing round the
edge of a board, and the weight was quite handy for holding the board on
the table while I worked on the edge overhanging the table.

They sound handy. I'll have to check local skips