Hoppe's Universal Bore Guide

Keeps solvents from dripping into action and preventsexcessive cleaning rod contact with the rifling lands closestto the chamber.? Three interchangeable chamber tips to fit .17to .416 caliber.? Aluminum action collar fits .695"/.700"(17.65mm/17.78mm) diameter boltactions of any action length.? Threaded brass pin locks the guide into the actionin place of the bolt to allow proper cleaning fromthe breech.