Highly recommended for threading rifle barrelsDescription: This SS Right Hand Threading Alignment Tool (TAT) is a die starter for .22/.223 caliber rifles and 1/2 -28 TPI dies. It is to squarely guide the die onto the barrel of the gun, eliminating the chance of crooked threading, so buyer can attach muzzle brakes, flash hiders and other barrel mounted attachments requiring this pitch thread easily . Details: Ovrall length of TAT: approximately 1.5 Length of the threaded portion: 1/2 Length of the the bore side: 1 Material: Stainless Steel Package included: 1 piece of Threading Alignment Tool (TAT) Note: The purpose of this tool is ONLY to align the die at a perfect 90 degrees to the barrel. Buyer should always thread the TAT into the start side of the die first so there is a gap between the first cutting threads and the TAT. This item is slightly under .22, as it is sometimes to see bores that vary in size.