They are designed to clip onto the edge of a palette to hold solvents and oils during painting. Available in single or twin designs with lids.
I find that an elastic band round the top of the dipper lid is all that is required to get a grip. Robin Sharples (Rossendale) on 1 Apr 2010
I found the best way was to thoroughly clean the thread and then apply a little Vaseline to the thread; renew the Vaseline as and when. Roy Wilkinson (HERNE BAY, United Kingdom) on 24 May 2012
This was just what we were looking for. The seal is great on all the ones we purchased and it is made of good quality metal. Philip Bettinson (Mold, United Kingdom) on 26 Mar 2012