The Redding Competition Seater Die has solved the concentricity problems inherent in other seating dies of this type. Tighter manufacturing tolerances have been made possible due to the details of the patented seating stem system. The bullet guide to seating stem fit is so precise that the seating stem can actually be demonstrated to "float" on a column of air. The seating stem is precision ground to exactly match bullet diameter. Alignment and accuracy are enhanced by the cartridge case and bullet being completely supported and aligned in a close fitting, precision ground sleeve before bullet seating begins. The micrometer is calibrated in 0.001" increments for precise seating depth and is infinitely adjustable (without clicks). Also has a "zero set" feature that allows you to zero the micrometer to your rifle or favorite seating depth. Shellholder sold separately.Notes: THIS DIE DOES NOT CRIMP THE BULLET. A CRIMP DIE MUST BE PURCHASED SEPARATELY.