Regular Expander Die Body---7/8-14 threaded OD for standard press. Machined internally to accept 3/8" dia. shank expanders. This tool helps to keep your cases concentric during the expanding operation. The mandrel is then allowed to free float inside the case to compensate for press ram and shell holder misalignment. CNC Machined from stainless steel barstock. Knurled head for easy in and out adjustment. Aluminum cap retains expanding mandrel and allows for floating function. Aluminum Loading Die Locking Ring has a nylon ball and locking nut to hold in place.