Hornady Lock-N-Load Modified Cases B Series 6mm GT. A special fine thread is used on this Hornady reloading tool to attach it to the gauge ensuring that it remains perfectly square for precise alignment in the chamber of your firearm. Second the neck of the case is made perfectly round by the reloading tool and opens slightly to allow a standard diameter bullet to slip into the case mouth effortlessly but concentrically to ensure the most precise results possible. Hornady has included one modified case in each package so you can customize your workbench for your own arsenal. Use Hornady's precision gauges with the Hornady Lock & Load Precision Gauge Modified Case. Specifications for Hornady Lock-N-Load Modified Cases: Manufacturer: Hornady Quantity: 1 Color: Bronze Condition: New Fabric/Material: Brass Features of Hornady Lock-N-Load Modified Cases: Modified cases for use with Precision Gauges Uses fine thread to keep case square for precise chamber alignment Rounds neck of case and opens to allow a standard diameter bullet to slip into case mouth One modified case per package Package Contents: Hornady Lock-N-Load Modified Cases Hornady B6MMG: Lock-N-Load Modified Cases B Series 6mm GT