Lyman Carbide Pro Trims dies offer all of the features of the steel Pro Trim Dies, but have the added advantage of long lasting, super slick carbide inserts. 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.