The Lee Precision Micrometer Bullet Seating Die features dead length bullet seating with smooth, accurate adjustment. Tests prove sliding bullet guides provide cartridges with the least bullet runout. When used as a dead length bullet seating die, the body contacts the shell holder assuring precise uniform seating depth. Laser engraved micrometer thimble and body is easy to read with divisions representing one thousandth of an inch, reads just like a precision depth micrometer. Infinitely adjustable, providing precision bullet seating depth. Bullet seating stem is machined and burnished to seat nearly any point style bullet without damage or marking.The case mouth and bullet are held in perfect alignment by a floating bullet guide. The bullet guide is provided with radial clearance to allow the case and bullet guide to align perfectly with the bullet seater screw. The floating bullet guide is reversible, simply unthread guide and re-install to allow seating and crimping simultaneously, an exclusive feature to Lee.