USED Arisaka Defense Optic Leveler Combo Silver OL-Combo. The base plate sits on the Picatinny rail or one-piece mount just below the turret cluster of the scope and then the matching wedge is inserted from the side. As the 11 degree ramped surfaces of the wedge and base engage the top of the wedge rises upwards and contacts the turret cluster automatically leveling it. Specifications for Arisaka Defense Combo Optic Levelers: Manufacturer: Arisaka Defense Color: Silver Finish: Anodized Fabric/Material: 6061-T6 Aluminum Last Chance: Yes Country of Origin: USA Package Contents: Arisaka Defense Combo Optic Levelers Leveler base Both small and large wedges Arisaka Defense OL-Combo: Optic Leveler Combo Silver