Complete Comparator Reloading Set Included,The comprehensive head space gauge set includes: Comparator body 14 bullet inserts for diameters: 172, 204, 224, 243, 257, 264, 277, 284, 308, 338, 358, 375, 416, 458 6 headspace bushings: A.330, B.350, C.375, D.400, E.420, F.188 Allen wrench + setscrew Compatible with digital or standard calipers, this all-in-one press-ready kit supports everything from everyday reloading to advanced bullet seating depth gauge checks and even 5.56 headspace gauge work—offering a reliable solution for anyone using a lock n load bullet comparator or similar tools.