Seller: wvtools (9,879) 100%, Location: Clendenin, West Virginia, Ships to: US & many other countries, Item: 311544158509 Condition: See item description., Details: Good plus to very good condition;Spring loaded;I could not find the patent information for these items, so I do not know exactly what they are. If you have any questions, please contact me through the Ebay email system. Please see my Ebay Store for shipping and email schedule. I frequently cannot answer email for a few days. International buyers please contact me for shipping quote. International shipping includes a 1.00 handling charge and a fee to cover Ebay fees on the shipping amount.