1Characteristic: Tat die starter is approximately 1.5in long, the threaded portion is 1/2in, the bore side is 1in long and is slightly under .308. 2Usage: The purpose of the threading die starter is to guide the die directly onto the barrel of the pipe, eliminating the chance of crooked threading so you can attach pipe brakes. 3Premium Material: Threading alignment tool is made of premium stainless steel material, anti rust, wearproof, sturdy and durable, can deal with harsh environment. 4Exquisite Manufacturing: Other pipe mounted attachments requiring this pitch thread with ease, threading alignment tool is professionally manufactured, dependable to use. 5: The manufacturing conforms to the standard specification, strictly follows the factory quality control, can be used for a long time.