This one I have used a silver plated (was SP but now copper as I left it in thje cleaning solution to long and had to sand off the SP) adjustable ring base size 6 1/2 and up and glued a lovely lampwork dusty blue glass bead with swirls of wine, red and green. It is about 16mm or 5/8" wide and about 8mm or just over 1/4" thick. Check out my other items.. I will happily combine purchases paid together within a 7 day period. CANADIANS PLEASE READ I am a registered business and must collect and pay the 5% GST within Canada.