Lyman Improved Lube and Sizing Dies now have 90 degree hole spacing. It is now easy to lubricate bullets even with today's hard lubricants. Lyman sizing dies also feature a tapered mouth and hardened interior insuring alignment for perfect cylindrical shape. Interior dimensions correspond to suggested diameters for all popular rifle and handgun calibers. Fits Lyman 450/4500 Lube Sizer and RCBS Lube-A-Matic-2 Bullet Sizer/Lubricator. Sizer dies also help to crimp the gas check on the base of gas check style bullets. Notes:Sizes and Lubes Cast BulletsFor Use with RCBS or Lyman Bullet Sizer/LubricatorsAlso Helps to Crimp the Gas Check on the Base of Gas Check Style Bullets