The feeler gauges are made of high quality stainless steel with a lubricating oil coating to prevent pitting and corrosion, sturdy and durable. Two metric and imperial markings, each blade has laser engraved size identification for easy use, measuring range: 0.04-0.88mm / 0.0015-0.035;. Valve gap shim set helps you measure valve gap accurately. It is flexible and makes it easy to access hard-to-reach places. Each steel feeler gauge has 32 blade thicknesses, foldable feeler gauges, easy and convenient to carry and clean up. Widely used in spark plug gaps, bearing clearances, piston ring gaps and 3D printers. Specifications: Material: stainless steel. Measuring range: 0.04-0.88mm / 0.0015-0.035;. Diameter: Metric (mm): 0.04, 0.05, 0.06, 0.08, 0.10, 0.13, 0.15, 0.18, 0.20, 0.23, 0.25, 0.25, 0.28, 0.30, 0.33, 0.35, 0.38, 0.40, 0.43, 0.45, .48, 0.50, 0.53, 0.55, 0.58, 0.60, 0.63, 0.65, 0.70, 0. 75, 0.80, 0.88 Imperial : 0.0015, 0.002, 0.0025, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 9,