The SME Bubble Level Anti Cant Device boasts a streamlined eye-pleasing appearance that blends in perfectly with traditional scope rings while helping to eliminate accuracy robbing canting errors. The easy-to-see offset level helps make immediate corrections without taking your eyes off the target. It attaches to your riflescope as a traditional scope ring halves clamp together with two steel Allen-head screws. Constructed from aluminum the ambidextrous design works for both left and right-handed shooters.