Pin measures approx. a little over 1/4" X5/8 ", and is not marked. Clasp works fine, and there is a hook on the bottom, I would guess for a chain to attach to something else, Please see all photos and ask any and all questions prior to looking! Thanks! Launched from my store - Powered by Highwire.com Track Page Views WithAuctiva's FREE CounterEvery buyer gets a MyStoreRewards invitation for cash backPlease email us for details on this item! Unfortunately, we have thousands of items, and no easy way to handle the situation involving HTML hidden wording. We apologize to our customers.