I got mine when someone unloaded it on me in a mouthpiece trade. Makes lovely screw indentations on the top of your mouthpiece. The cap is a bit weird, but should you enjoy splitting a reed with it on a gig, it just might be for you. I was using mine for some time because my bari mouthpiece was somewhat hard to fit (and yes, it will fit a variety of pieces), but recently I discovered it'll take a regular tenor ligature, so back in the drawer it goes to await perhaps another hard to fit piece.