One Used and BROKEN Old School Mongoose Pro Class BMX Bike Quill Stem. For 1" Threaded headsets. 45mm Length. 22.2mm bar clamp. 21.1mm Quill Diameter. As you can see the bottom of the quill is broken off. See the last three pictures. Could probably be fixed by welding, etc. I do not have the piece that broke off. Just throw us some offers.