Two drawer add on for Vertex Toric oblique BC 8.6. Cyl powers include -0.75, -1.25, -1.75. Sphere powers include: +1.25, PL, -0.50, -1.00, -1.50, -1.75, -2.00, -2.25, -2.50, -2.75, -3.00, -3.25, -3.50, -4.00, -5.00, -6.00. Axes include: 30, 40, 50, 60, 120, 130, 140, 150. Dimensions: W 12 3/8", H 5 13/16", D 12 3/16"