SKI-DOO QRS secondary clutch roller stud pair (nord lock washers not included). These are the early style which take the e-clip and can be used on any year 2008-2021 XP, XS, XM OR GEN4 chassis which has the QRS secondary clutch. Many of these years had various pins etc. to lock the stud from backing out- this qrs roller stud can replace all of those and can also be used in conjuction with the FPB rollers kits we sell which include the rollers and e-clips to lock these pins. This stud is easier to install than the pin style. No more fighting to get micro size roll pins out and back in while screaming profanities at Ski-doo engineering once you use these studs! If you intend to use these with a stock ski-doo roller you must order e-clips separately. These do not come with the nord lock washers shown in the pic- re-use the ones on from your original QRS roller studs (they all had them). Roller studs are sold per pair.