9 original unused B&L pieces in all to make a replacement focusing eyepiece for your 7x50 binoculars! We know this will fit the Mark 28 and numerous others. You will receive the following: eyeguard, diopter retainer, diopter scale, focusing eyelens housing, field lens, eyelens (flat side must face towards your eye), field lens retainer (only used if your 7x50 has a reticle), and retaining adapter (for use without a reticle). Assembles in a matter of minutes. This could also be made into an 1-1/4" Kellner eyepiece (focal length of 25mm) with the simple addition of a 1-1/4" barrel (our M4672). An amazing value.