Dewey ABS-2 .24-7mm Breech Bore Cleaning Guide Made from hard plastic, this bore guide replaces the bolt in your match rifle action while cleaning. The guide allow the cleaning rod to go straight into the bore without hammering the chamber or throat. When you consider the price of a good barrel, this is a good investment. Product Specifications ABS-2 Adjustable Bore Saver Rod Guide Fits .24-7mm Calibers 10 Inch Overall Length Anodized Aluminum Rod Guide Tube with Solvent Port Adjustable Aluminum Locking Collar with Brass Pin O-Rings to Seal the Chamber and Keep Solvents/Oils Out of Receiver Replaces the Bolt Fits Rifles with .695-.700 Diameter Bolts