1.Place scope in rings or one-piece mount. Tighten rings to remove slack, but leave loose enough that the scope can still be rotated by hand. 2.Place the leveler base on the Picatinny rail or one-piece mount directly the turret of the scope. The angled slot should be on the top side. 3.Insert the leveler wedge into the slot on the base from the side until it contacts the bottom of the turret . 4.Gently apply pressure to until the scope rotates and is leveled. 5.Tighten one scope ring according to the torque specifications provided by the ring/mount manufacturer. Remove the optic leveler. Tighten the other ring according to the torque specifications provided by the ring/mount manufacturer. Use of the Arisaka Optic Leveler makes the assumption that the scope's turret and reticle are aligned, which may not be the case with poor quality scopes. Special features:correction Ability training:grasping, other ability training, interactive toys, interest training Colour:As Shown Material:CNC Aluminum Package Contents: 1Set * Telescope Vertical Corrector Tool Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.