Hornady Lock and Load Ammunition Concentricity Gauge 50076. This gunsmith and reloading tool lets you both identify and get rid of bullet runout. The Hornady Lock-N-Load Concentricity Gauge is easy to use; simply place your ammo in the tool roll it determine runout and adjust the runout to zero with the dial indicator. You can also use the Hornady Lock-N-Load Ammunition Concentricity Tool to true-up factory ammunition as well making this unique tool a valuable addition to your workbench. Specifications for Hornady Ammunition Concentricity Gauge: Weight: 3.65lbs Features of Hornady Bullet Runout Gauge: Accurately measures and corrects bullet runout Can be used to true-up factory ammo Dial indicator Package Contents: Hornady Lock-N-Load Ammo Concentricity Gauge 050076 Hornady Lock-N-Load Ammo Concentricity Gauge - 050076