These plates are sold by the pair
Rogue Calibrated LB Steel Plates
Machine calibrated for next-level precision, these durable cast-iron LB plates are accurate to within 10 grams in weight. Each disc is cut thin to allow for max loading capacity (up to 1500+LB) and color-coded for easy identification from a distance. The back of each plate includes calibration plugs (lead on smaller plates, brass on plates 5LB and up) for an ever greater level of precision. A 50MM center hole is designed for a snug fit on a standard barbell, and as a result, may not fit on some cheaper barbells not held to spec.