This tMA-24 Clip-On Adapter allows the Swarovski tM 35 Thermal Monocular to be very easily converted from a handheld device to a clip-on device. Together with your 24mm objective-lens riflescope, the thermal imaging device creates a powerful combination that requires no sighting in and guarantees a 100% reliable point of impact, each and every time. The tMA thermal monocular adapter is compatible with SWAROVSKI OPTIK Z8i, Z6i, Z5(i), and Z3 riflescopes. (Not compatible with 1.25-4x24, 1-6x24, 0.75-6x20, or 1-8x24 with SR.)