Mount the Razor red dot at a 45 degree angle alongside your primary magnified optic for optimal aiming versatility when the situation gets up close and personal. Precision-machined aluminum with hard-coat anodized finish ensures lightweight durability. The RT45 attaches to either side of a Picatinny rail to accommodate left or right handed shooters. NOTE:- Fits Vortex Razor Red Dots. Will not work with Viper or Venom Red Dots.