The Safari Die Series' 3-Die Roll Crimp Set covers straight-wall cartridges typically used for dangerous game in Africa. Its steel sizer die sizes the case and de-primes. Note: Cases must be lubricated. The Expander Die expands the case to the proper diameter to accept the bullet and it imparts case mouth flare/bell for bullet feeding. The Seater Die seats the bullet and roll crimps. The .500 Jeffery and .505 Gibbs are made on 1-inch die bodies and require a press adapter bushing (not included). Note: The Rock ChuckerA(R) Supreme comes standard with a 1-1/4-inch-12 to 7/8-inch-14 press bushing adapter.