RCBS 3-Die Roll Crimp Set - Group C - Straight Walled Rifle Calibers.360 Buckhammer. 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. Specifications for RCBS 3-Die Roll Crimp Set - Group C - Straight Walled Rifle Calibers: Manufacturer: RCBS Caliber: .360 Buckhammer Quantity: 3 Color: Silver Fabric/Material: Steel Gun Type: Rifle Projectile Caliber: .358 Caliber Features of RCBS 3-Die Roll Crimp Set - Group C - Straight Walled Rifle Calibers Features a hardened steel Sizer Die (case lubrication required) Expander Die to properly expand case to accept bullets Roll Crimp Seat Die to crimp case to bullet to eliminate bullet movement Comes in green storage box All RCBS dies are machined to exacting tolerances hardened and finished to the highest standards in the industry Package Contents: RCBS 3-Die Roll Crimp Set - Group C - Straight Walled Rifle Calibers RCBS 28304: 3-Die Roll Crimp Set - Group C - Straight Walled Rifle Calibers.360 Buckhammer