Aperture Kit with the three smallest apertures 1/32", 3/64", and 1/16". The three apertures will interchange in all Specialty Archery Peeps without removing the peep from the string. You will need a reducer (753-3) if you want the apertures to fit the 749-37L, 749-37LH, 749-42LH or 753-1 peeps. Kit includes 3 apertures (1/32", 3/64", 1/16"), clear storage case, and dual aperture wrench.