Double hollow rivets are easy to process and are well suited for fixing all types of mechanisms, e.g. clamp or ring binder mechanisms. They consist of a lower and an upper part. These are inserted into each other with the help of a hammer or a special riveting tool. We recommend using one of our riveting tools, as these are adapted to the roundness of the rivet head. So the head of the hollow rivet will keep its round shape and will not be knocked flat.