Saeco Lubri-Sizer Lube and Sizer Dies are made with a unique pre-lead that fits the "as cast" bullet diameter for a depth of approximately .3". This special entrance throat helps to ensure that the bullet feeds into the sizing die in absolutely straight alignment. The constriction between the two diameters is a gentle taper which helps to eliminate lead shearing and sizes the bullet concentrically. Saeco Lube and Sizer dies have a mirror like finish and a sizing hole that is perfectly round. Once run through the die bullets will look like they were polished silver with no lead shavings.Fits: Saeco Lubri-Sizer ONLY