24 metric blades Gauge for 60° screw pitch, 0.25 mm to 6 mm Steps Up 0.25-0.3-0.35-0.4-0.5-0.6-0.7-0.75-0.8-0.9-1-1.25-1.5-1.75-2-2.25-3-3. 5-4-4.5-5-5.5-6