RCBS 3-Die Carbide Taper Crimp Die Sets are machined from our proprietary die steel to exacting tolerances then undergo a meticulous finishing process to give the hand-loader the best dies on the market! Each 3-Die set includes a Carbide Sizing Die, Expander Die, and Bullet Seating Die. RCBS pioneered and developed 3-Die Sets for straight-wall rifles and pistol cases. These sets for straight wall pistol cases build off of that legacy. Each set features a Carbide Sizing die that requires no case lube to speed up your sizing. The Expander die expands the case to the proper diameter to accept the bullet and also imparts case mouth flare/bell for easy bullet feeding. The bullet seating die then seats the bullet and puts on the appropriate crimp for the round being loaded. Carbide Size Die eliminates need to lubricate case before sizing Expander Die properly expands case to accept bullets and imparts case mouth flare for easy bullet feeding Bullet seating die seats bullet and applies appropriate crimp Made in USA Component and Caliber Reference Table