These are replacement Male and Female Snap Rivets to be used to fasten the Shaft Strap Main Body and Strap Assembly or to a bag. OR In the case of a stand alone lock the rivets are used to fasten the Backer Plate and Strap Assembly to the Main Body. These are a one time use Rivet so if you are using this lock for example Hockey and Lacrosse and want to move your Strap to accommodate the different sports you will need to buy extra rivets.