Lyman Pro Carbide Trim Die 300 AAC Blackout. The outside die bodies are made of stainless steel and are threaded 7/8x14 to fit all standard machines. The top thread is 13/16x20 for use with Lyman's Power Trim Xpress or other popular press mounted trimmers. Inside of the stainless steel bodies are highly polished long-lasting carbide inserts that will last a lifetime of heavy use without wear. From high volume shooters to commercial loaders these dies make your trimming operation run smoothly and efficiently. Specifications for Lyman Pro Carbide Trim Die: Manufacturer: Lyman Fabric/Material: Stainless Steel Features of Lyman Pro Carbide Trim Die Stainless steel for increased toughness and corrosion resistance Carbide inserts for heavy duty use without wear 13/16''x20 top threads for use with Lyman's Power Trim Xpress or other popular press mounted trimmers Package Contents: Lyman Pro Carbide Trim Die Lyman 7702111 Lyman Pro Carbide Trim Die 300 AAC Blackout