Forster Products Neck Tension Gage Features The Forster Neck Tension Gage consists of four stepped diameters that increase in size toward the handle with each diameter etched directly onto the tool for easy reference. To use it the reloader simply inserts the stepped end into the neck of a sized case and slides it in until one of the diameters achieves a slip fit revealing the actual inside neck diameter of that case. That reading gives reloaders the information they need to fine tune their case preparation and create exacting consistent neck tension during the bullet seating step. Consistent neck tension directly affects how uniformly a bullet releases from the case under pressure which in turn affects velocity consistency and accuracy. Beyond measuring neck tension the gage also allows reloaders to inspect for a donut a small ring of brass that can form at the neck shoulder junction after repeated firing and resizing. Catching a donut before it affects bullet seating or chambering helps prevent inconsistent loads or feeding issues downrange. Built for .224 caliber cases this gage gives precision rifle reloaders a dedicated quality control step that many handloading processes otherwise skip. The Forster Neck Tension Gage is for sale at GrabAGun for reloaders who want to screen and sort their brass with real data before committing to a seating depth. Forster Products Neck Tension Gage Specifications Manufacturer: Forster Products Caliber: .224 Cal Type: Case Neck Gauge Weight: 0.11 lbs Available At: GrabAGun