The Redding Seating Die includes bullet guide, built-in crimping ring and the proper caliber seating plug. Like all Redding dies, this die is carefully machined out of high quality alloy and then hand polished for reliability and consistent performance. 7/8" x 14 tpi threads will fit most popular reloading presses. Notes:A Bullet Seater is used to push (seat) the bullet down into the case to a specific depth and is found in the Seating die.