The J. Dewey ABS-3 Adjustable Bore Saver Rod Guide is designed for .30-8mm caliber rifles with a 10-inch overall length for professional-grade firearm maintenance and cleaning.ABS-3 Adjustable Bore Saver Rod GuideFits .30-8mm calibers10 inch overall lengthAnodized aluminum rod guide tube with solvent portAdjustable aluminum locking collar with brass pinO-rings to seal the chamber and keep solvents/oils out of receiverReplaces the bolt during cleaningFits rifles with .695-.700 diameter boltsEssential for maintaining rifle accuracy and preventing bore damage during cleaning this rod guide ensures proper alignment and protects your rifle's chamber and receiver from cleaning solvents.