The RCBS 3-Die Carbide Taper Crimp Set for .40 S&W/10mm Auto is a high-quality, durable die set crafted from polished and heat-treated steel. This set includes a Sizer Die with Decapping Unit, an Expander Die for expanding and belling case mouths, and a Seater Die for seating and taper crimping bullets. Featuring carbide construction, it eliminates the need for sizing lube, simplifying the reloading process. Packaged in a convenient plastic storage case, the set is backed by RCBS’s Lifetime Guarantee. Shellholders are sold separately.