These measure approx. 5/8", and are marked SILVER, but test as STERLING. The name of the maker is on the cufflinks, but so worn I can't tell who it is, sorry best pics I can get. These need a good polishing and cleaning! Please look at all photographs, as they are part of the description and ask any and all questions prior to looking. Thanks! Launched from my store - Powered by Highwire.com Track Page Views With Auctiva's FREE CounterEvery buyer gets a MyStoreRewards invitation for cash back