The rcbs universal primer arm 2 is designed for fast, accurate primer seating.Primer plugs and sleeves are included for large and small rifle and pistol primers.Changing sizes is fast and easy, taking less than 60 seconds.The arm fits rock chucker ii, jr, reloader special and most c presses.Note: this item is not for use with rock chucker supreme.Type: Primer Arm-2Caliber: Small/LargeSize: Small & Large PrimersQuantity: 1Compatible With: Large/Small PrimersMaterial: MetalFinish: Silver