Lyman has refined their sizing dies with 90-degree lube hole spacing, a critical improvement that ensures optimal flow of even the hardest lubricants used by today's bullet casters. This enhanced geometry, combined with a tapered entrance and a hardened steel interior, delivers ideal alignment and uniform bullet shaping-essential for achieving consistent accuracy. Each die's interior diameter is precisely dimensioned to correspond with the recommended sizes for a broad spectrum of common rifle and pistol calibers. Matching these dies, Lyman's top punches are CNC-machined to mirror bullet nose profiles exactly, eliminating distortion and preserving ballistic consistency during the lubing and sizing process. Constructed with high-grade hardened steel for maximum strength and resilience The tapered mouth design improves feeding and reliability in your firearm 90 degree lube holes facilitate optimal lubrication for smooth mechanical operation Compatible with RCBS punches for versatile reloading options