Die set consists of Full length size die and Seating die.Dies have 1" body. Die Bushing of 1 1/4" -1" needed for 1 1/4" pressesDesigned for 510 bulletShellholder required # 416 in special shellholder category or X17 in Lyman shellholder categoryShellholder sold separatelyDo you need? Die BushingSpecial Shellholder.Unprimed BrassBig Game Rifle Projectiles