Use the Bering Optics Throw Lever Mating Adapter for BEAST C-336 Thermal Clip-On to attach your thermal or night vision clip-on to your day riflescope. This aluminum adapter screws on instead of the ocular eyepiece of your Beast C-336, Night Probe, or Night Probe Mini clip-on and clamps it to your scope's 60mm objective bell. The anodized aluminum adapter utilizes a lever for a quick clamping action to your day scope and provides a strong connection between your thermal clip-on and the riflescope.