The RCBS 1 1/2-Inch-12 Trim Die is a unique hardened die designed to be used with a file to trim oversized .50 BMG cases to the correct length. It features a 1 1/2-inch-12 thread and is designed for use with the RCBS AmmoMaster press with the .50 BMG Conversion Kit installed. This ensures a secure fit and reliable performance when used with the press. To use the die, you first need to run the oversized case into it. The die will cut off any excess length, leaving you with a properly trimmed case. Because this die is hardened, it is durable and long-lasting, allowing you to trim many cases before needing to replace it. If you are a reloader who frequently works with .50 BMG cases, this trimmer die is a must-have tool in your arsenal. It will save you time and effort by ensuring your cases are properly trimmed to the correct length every time. Designed for use with the RCBS AmmoMaster press with the .50 BMG Conversion Kit Hardened die features a 1 1/2-inch-12 thread Use it with the .50 BMG Conversion Kit Made in USA Component and Caliber Reference Table