In the steel industry, precise material positioning on continuous casting lines and rolling mills relies on optical sensors that detect the edge of moving slabs, billets, or coils. The reflective target—mounted directly on the conveyor frame or guide rail—returns the sensor’s light beam to confirm the exact location of the steel. As the slab advances, the sensor and reflector work together to trigger side guides, pinch rolls, or shear blades at the correct moment, preventing misalignment that could jam the line or damage equipment. The reflector’s durable plastic housing withstands the heat, dust, and vibration typical of hot-rolling and cold-rolling environments, ensuring consistent detection without frequent cleaning or realignment. On pickling lines, the same setup monitors strip position before entry into the acid bath, where even a slight deviation can cause uneven treatment or strip breakage. Operators adjust the reflector’s angle to match the sensor’s field of view, fine-tuning detection range for different slab thicknesses or strip widths without interrupting production.