Imperial graduated, 36 blade, feeler gauge. Dual marked in Imperial and Metric. 30 x Steel blades and 6 x brass blades for non-magnetic applications on electronic ignition systems. Blade dimensions 75 x 13mm.Model No:VS513Blade Sizes:Imperial Steel:0.002", 0.0025", 0.003", 0.004", 0.005", 0.006", 0.007", 0.008", 0.009", 0.010", 0.011", 0.012", 0.013", 0.014", 0.015", 0.016", 0.017", 0.018", 0.019", 0.020", 0.021", 0.022", 0.023", 0.024", 0.025", 0.026", 0.028", 0.030", 0.032", 0.035"Imperial Brass:0.006", 0.008", 0.010", 0.012", 0.014", 0.016"Metric Steel:0.051, 0.063, 0.076, 0.102, 0.127, 0.152, 0.178, 0.203, 0.229, 0.254, 0.279, 0.305, 0.330, 0.356, 0.381, 0.406, 0.432, 0.457, 0.483, 0.508, 0.533, 0.559, 0.584, 0.610, 0.635, 0.660, 0.711, 0.762, 0.813, 0.889mmMetric Brass:0.152, 0.203, 0.254, 0.305, 0.356, 0.406mm