Zero Tech Optics THDM21: The latest addition to the ZeroTech range is the ready on demand Thrive HD Micro Reflex sight with advanced shake awake technology. Built on the popular Shield RMSc footprint, the Thrive HD Micro Reflex will mount to most compact pistols. It can also be adapted to other firearm platforms and used as an ultra-light weight backup sight. Includes: ZT Thrive HD Micro Reflex sight, Rubber protective cover, Microfiber lens cleaning cloth, Hex keys for sight attachment, Mounting screws sets x 3