Aperture Kit with the three largest apertures 1/16", 3/32", and 1/8". The three apertures will interchange in all Specialty Archery Peeps without removing the peep from the string. You will need a reducer (753-3) to insert the apertures in the 749-37L or 749-37LH peeps. Kit includes 3 apertures (1/16", 3/32", 1/8"), storage case, and dual aperture wrench