Dealglad 0.02 to 1mm 17 Blade 300mm Metric Feeler Gauge Gap Filler Measure Tool Every blade with its thickness clearly on it, easy to select Also easy to return when you don't use Ideal for feeler gauge valve shim use and metric gap measuring between two items or parts. It contains 17 blades, from 0.02mm to 1.00mm. The blades are made of high quality carbon steel.