High quality: The feeler gauge is made of high quality stainless steel with a lubricious coating to prevent rust and corrosion Portable: each measuring feeler gauge has 32 blades thickness; Foldable feeler gauges, easy and convenient to take and store Easy to identify: Each feeler has laser-etched dimensions, and has metric and inch dual marked for easy identification. metric from 0.04mm to 0.88mm, inches from 0.0015 to 0.035. Versatile:Widely used in construction,railway shops,Teaching,ceramic sanitary ware,measurement of gaps between automobile windshield, mold gap and other hard to reach places Warm notice: there is some anti-rust oil on the stainless steel feeler gauge to prevent it from rusty, please don't worry about that