The ribbed pins are a perfect retention and tightening for impressions of prepared tooth canals. The ribs made it reliable the impression material adheres. They are characterized by considerable endurance and flexibility.
The endopin may be adjusted by cutting it from the thicker or thinner side, depending on the canal section ("the diameter"). When dealing with thin canals, it is necessary to cut off the thicker part of an endopin together with the head, which is not reducing its functionality by no means.
Another possible application of pins is tightening the models of post and core made of wax or resin that burns residue-free, before a metal cast is made.