The NTG-224 Neck Tension Gage is a precision inspection tool designed for .224 caliber cartridge cases enabling reloaders to quickly and accurately screen brass before bullet seating operations.NTG-224 Neck Tension Gage for .224 caliber cartridgesFour stepped diameters with etched measurements for precise neck sizingHelps determine optimal inside neck diameter for consistent bullet releaseDetects "donut" formation at neck-shoulder junctionUse after case neck sizing and before bullet seatingEnables fine-tuning of case preparation for exacting neck tensionsEssential for precision reloaders who demand consistent neck tension and optimal bullet seating performance. Simply insert the stepped end until achieving a slip fit to determine the exact internal neck diameter for your sized cases.