The Double Pin scope adopts the BulletProof pin technology found in their multi-pin sights and incorporates it into single vertical pin with dual fiber optic aiming points. It is lens and light ready without any additional adapters. It also comes with the option of either single alignment ring or triple alignment ring for those archers looking for better accuracy in varying lighting situations. Mounted on 1/4-28 threaded rod, it will fit all of the Hogg Mobb series adjustable sights. Single Vertical BulletProof pin. Dual fixed fiber optic aiming points. Comes with both 1.625” I.D 2” O.D. (single alignment ring) and 2.375” O.D. (triple alignment ring). Lens ready. Precision level. Solid 6061 aluminum construction. Available in .010, .019, and .029 fiber optics.