The Sinclair Hex Style Bullet Comparator #2 is designed for precise bullet measurement and sorting for 17-338 caliber ammunition.Sinclair Hex Style Bullet Comparator #2Compatible with 17-338 caliber bulletsHex style design for secure grip and accurate measurementsProfessional reloading tool for consistent ammunitionEssential equipment for reloaders who demand precision and consistency in their ammunition preparation and bullet sorting process.