Thanks Julian and Malcy...interesting links, but none of them stock what I'm after.
What I'm looking for is the type that has two circular rings, mounted on top of each other, with a hings at the back and a catch at the front. I've seen several different patterns and have three patterns in stock, but I'd like to buy more and the only ones that I can currently source is the type stocked by Axminster (and others) which look a bit 'brassy' and garish.
Les