Arisaka Defense Optic Leveler Small, Silver, OL-Small Easy-to-use device for leveling scopes in one-piece mounts or separate scope rings Minimum gap between turret cluster and mount/Picatinny rail: 0.190" Maximum gap between turret cluster and mount/Picatinny rail: 0.730" Machined from 6061 aluminum and type 3 hard coat anodized for durability 100% made in the USA