Hoppe's Universal Bore Guide SPECIFICATIONS BRAND: HOPPE'S CA PROP 65: YES CA PROP 65 CHEMICAL: LEAD CLEANING ITEM TYPE: BORE GUIDES USAGE: UNIVERSAL DESCRIPTION Keeps solvents from dripping into action and prevents excessive cleaning rod contact with the rifling lands closest to the chamber. • Three interchangeable chamber tips to fit .17 to .416 caliber. • Aluminum action collar fits .695"/.700" (17.65mm/17.78mm) diameter bolt actions of any action length. • Threaded brass pin locks the guide into the action in place of the bolt to allow proper cleaning from the breech.