The Lyman pro trim dies are precision-engineered tools crafted in the USA, adhering to Lyman's stringent quality standards. Constructed from durable stainless steel, these dies are designed for a lifetime of reliable use. They feature a 7/8-14 thread on the bottom, ensuring compatibility with all Lyman, Mark 7, and other reloading presses available in the market. Additionally, the top thread is 13/16-20, making them suitable for use with Lyman's new press-mounted trimmer as well as a variety of other popular press-mounted trimmers. The Lyman Pro Trim Die offers durability and dependability with its lightweight and enduring construction Heavy-duty build, adherence to high-quality standards, made from stainless steel