For target focus training with your Holosun 407C/507C Blocks all light from coming into the front of the optic, this leaves a perfect theater for your red dot to appear consistent in any lighting conditions. Our Patent Pending one-sided red dot covers are molded from Kydex that snaps to the front of the optic and stays on during live fire. The SBGW TFT is perfect for shooting in adverse conditions! No more low angled sun washing out your dot. Run the same brightness in any lighting condition. Shooting directly into the sun, or shooting into bright lights, the Stonebridge Gunworks Target Focus Trainer truly blacks out your optic for these shooting conditions.