H&I Lube and Size Die .431 Diameter by Lyman Reloading Product Overview now offers the Lyman H&I Lube and Size Die .431 Diameter. The Lube and Size Die is essential for casting accurate bullets. This die is constructed of hardened steel and has a tapered mouth that will guarantee the correct alignment. The die has lubrication holds spaced at 90 degrees to make even the hard type lubes easy to apply. The Lyman H&I Lube Dies are interchangeable with RCBS dies. Specifications and Features: High Grade Hardened Steel Tapered Mouth 90° Lube Holes Interchangeable with RCBS