I know most multi-tools have more than four functions, but none I’ve seen are as small and unusual as these Titan Multi Tool Collar Stays from Yanko Design. The stays are made of 100% titanium, and they are 2.5″ long, 5/16″ wide, and less than 1/8″ thick. Each stay also functions as a half-phillips and a slot screwdriver, a bottle opener, and a thread cutter. If you don’t wear collar stays, holes in the tops of the stays allow them to slide onto a keyring. A pair costs $30, and two pairs are $50. This could be the perfect Father’s Day gift for the undercover dad!