Convenient blades are etched with both decimal size and metric equivalents for easy measurement. -Easily measures gap widths -Durable, flexible steel construction Blade thicknesses included are 0.0015", 0.002", 0.003", 0.004", 0.005", 0.006", 0.008", 0.009", 0.01", 0.011", 0.012", 0.013", 0.014", 0.015", 0.016", 0.017", 0.018", 0.019", 0.02", 0.021", 0.025", 0.027", 0.03", and 0.04". Blade dimensions are 12"L x 0.5"W.