5/8-24 Thread Alignment Tool TAT/Die Starter for .308/7.62mm Barrels Gunsmithing - TyCa Industries Sized for .308/7.62mm barrels - Also works with most .30 calibers(.30-06, .30-30, etc.) Hex socket cap allows using an allen wrench to prevent the TAT from rotating while threading Stainless Steel 1.75" Shaft ensures precision Manufactured exclusively by TyCa Industries Lincolnton, NC