This die body works with lee's deluxe quick trim case trimmer to quickly and precisely trim brass to the correct length at the same time it chamfers the inside and outside of the case mouth.No calipers, measurement or adjustment required.Simply install the appropriate quick trim die in your press and start trimming.Type: Quick Trim DieCaliber: 300 Win MagDie Type: TrimmerDie Series: Quick TrimIn Set: 1Metal Type: SteelShell Holder Cap: No