The Lee Deluxe Handgun 4-Die Set is a great set of reloading dies for anyone looking for a set of dies that will reload accurate ammunition every time the dies used. Each Deluxe 4-Die Set comes packaged with a carbide full length sizing die with decapping unit, powder through expanding die (used for expanding and belling the case mouth while charging the case with powder), a bullet seating die, and Lee exclusive carbide Factory Crimp Die. The carbide Factory Crimp Die is that final step to make sure each round with positively chamber freely with factory-like dependability. The Deluxe 4-Die set also comes packaged with the appropriate shellholder, powder dipper, load data sheet and flat 4-die plastic container. Carbide dies do not require the cases to be lubricated prior to use like non-carbide dies.