One-Piece Cantilever Scope Mount with Bubble Level. Solid one-piece aluminum alloy mount fits both 25.4mm (1″) and 30mm scope tubes, for standard 20mm Picatinny rails. Integrated bubble level prevents optic cant to boost shooting accuracy. Offset design creates extra eye relief space for large objective scopes. Hollow cutout frame reduces weight while keeping rigid recoil resistance. Matte black anti-glare anodized finish for outdoor durability.