Lymans Pro Maximum Cartridge Gauges offer unmatched precision for competitive shooters. Machined from corrosion-resistant stainless steel, these gauges check pistol ammunition for case length, diameter, and overall cartridge lengthensuring flawless reliability. Designed with flat sides to prevent rolling and fitted with O-rings for a secure grip, they're a must-have for serious reloaders who demand consistency. Includes: One Pro Maximum Gauge