A fastener with a threaded shaft to allow for quick, tool-less assembly/disassembly.
http://www.traderscity.com/board/products-1/offers-to-sell-and-export-1/thumb-screw-65177/
http://www.accuratescrew.com/Thumb-Screws.aspx
http://www.traderscity.com/board/products-1/offers-to-sell-and-export-1/thumb-screw-65177/
http://www.accuratescrew.com/Thumb-Screws.aspx