These Doubla Alpha 2-in-1 Seating and Crimping dies, enable you to Seat and Crimp in one station, without compromising the quality of your ammo. It may take a little longer to get the adjustments just right, but once calibrated correctly, this die will produce consistent and precise quality ammunition. There are two crimp shoulders in these Bullet Seating Dies. The first shoulder applies a slight taper crimp and the second shoulder applies a full roll crimp. The closer the die is adjusted to the shell holder the heavier the crimp will be.These dies include an O-ring lock machined into the nut, which allows you to hand tighten only - and the die stays put! They include a finger adjustable floating bullet Seater, are heat treated to ideal hardness and polished to the smoothest finish.DAA 2-in-1 Seating & Crimping die - Set up Instructions: This die frees up a station in your progressive-press tool head, making space for a bullet dropper die on your 550, or, allows you to use a bulle...