The simple, precise, and versatile Universal Bullet Seating Die holds .224 to .338 caliber bullets in place while seating, including a built-in micrometer allowing for precise micro-adjustments to the seating depth of the bullet. With a standard 7/8 x 14 thread, adjustable seating depth, and included molded case, this is a must have for your bench. Mfg: Frankford Arsenal