This 32 blade feeler gauge is perfect for all of my gapping needs! I had a gap gauge that only had 3 guages left, and so this was the perfect replacement! I am so glad I decided I needed this! The first item on the list was the spark plugs! YAY! My car is not missing anymore! I love that it has both inches and milimeters! Metric is very hard to find in these things. Each blade is marked with it's thickness. This will be in my tool box and used often!