Real Avid Smart-Fit Bore Guide Black. The spring-loaded slider locks providing a secure fitment and ensures a consistent chamber sealing with zero movement when running brushes and patches through your bore. An anodized aluminum tube is designed for lasting durability and the contoured non-marring bore-specific tips ensure damage- free precise fitment on centerfire rifles from .223 .375 caliber. Specifications for Real Avid Smart-Fit Bore Guide: Manufacturer: Real Avid Fabric/Material: Aluminum Color: Grey/Red/Black Included Accessories: 3 Tips Features of Real Avid Smart-Fit Bore Guide First of its kind spring-loaded precision bore cleaning tool Allows for a consistent chamber sealing Impervious to solvents Anodized aluminum tube Locking keys for both bolt guns and AR platform guns 3 contoured interchangeable heads allow for better fit and protection Fits centerfire rifles .223 - .375 Cal Package Contents: Real Avid Smart-Fit Rifles Cleaning Bore Guide 3 Tips Real Avid AVBMBG: Smart-Fit Bore Guide Black