No need to wonder what size titanium collar stays your shirt requires, because the geniuses at Swiss Stays have created an adjustable set. This pack of 3 pairs includes printed directions on their clever container that resembles a zippo lighter. Very creative! The patented adjustable stays can be adapted to fit any of the 24 dominant collar sizes. Moreover, stays adjustable to four lengths: 2", 2 1/3", 2 1/2", 2 3/4". You can see how they adjust with the additional pictures included.