Arisaka Defense Optic Leveler Combo, Silver, OL-Combo Easy-to-use device for leveling scopes in one-piece mounts or separate scope rings Machined from 6061 aluminum and type 3 hard coat anodized for durability, 100% Made In The USA Maximum gap between turret cluster and mount/Picatinny rail: 1.200" Minimum gap between turret cluster and mount/Picatinny rail: 0.190"