This is a snoot for pinpoint placement of the light from a Quantum T4D Qflash head. Use of a snoot will result in a small circle of light, when it is attached to the front of your light source. The size of the circle of light will be determined by the opening of the snoot, its length, & the distance of the subject. Consider them as a painter would a brush, or a sculptor would a knife, or chisel.