These helmet pins provide the fastest, easiest way to hang a helmet! Just slide the D-ring over the pin. It's more convenient than resting a helmet on the seat & there's no risk of the helmet falling off & becoming damaged. Available with 10mm thread to screw into right side mirror stud & Models with left mirror stud, or sized to replace clutch or brake lever pins.4207, Mirror Stud Helmet Holder with Lock (ea)