Metric Feeler Gauge Gap Measurement Tool 12-inch Long 17 Blades 0.02-1.00mm Thickness

The value for what you get is incredible. I just replaced both coils/magnetos on my ZTR lawn mower and needed to air gap the distance from the coil to the flywheel magnet. Generally, this distance should be 0.010 of an inch (i.e. one ten thousands of an inch). After many attempts at this precision using my regular six inch feeler gauges, I never could get it as precise as I wanted. After finding these on Amazon for only $8.95 and free Prime shipping, why not? These arrived two days later and were exactly what I needed. The exact sizes I needed were included (small, mid and highest acceptable tolerances). They were long enough that I could wrap them in front of the coil as I slowly rotated the flywheel to position the magnet in front of the coil. Once properly positioned, I loosened the coil adjustment screws to allow the magnet to clamp against the coil with the feeler gauge in between. I gently tightened up the adjustment screws and removed the feeler gauge to have a "perfect" 1/10,000 of an inch air gap. Mower runs like a Boss!

Great

Update August 2019:These gauges are still working fine for me but the ones that I use regularly are pretty corroded. The corrosion is a very thin layer so this is still fine for setting the gap for my 3D printer nozzle. I suspect that you are not supposed to wipe off the excessive amount of oil that is on them. The next time I buy a set of these, I will check to see if someone makes a stainless steel version.Original Review:I bought these to calibrate the nozzle height on my 3D printer (using .08, .09, .1). They work great for my purpose and the extra length makes them easy to use. They attach to the handle with a screw + plastic nut. I removed the ones that I use regularly so I don't have to hold the whole set all the time. I checked the accuracy of them with a cheap pair of digital calipers and they checked out. Not sure how precise these are for those that need more precision that I do.The only negative is that they are very oily -- I assume to prevent corrosion or maybe this is just from manufacturing. I cleaned them off with alcohol to avoid getting oil on my printer build surface.

I really don't know why everyone is whining about the product being shipped in oil. No where does this listing say it is stainless steel. ALL Metal products (that are not stainless steel) are shipped in a coating of oil, so they don't rust. So, when you get your feeler gauge set, either wipe off each blade one by one or spray it down with brake cleaner. Then, you had better apply a small amount of WD-40 or something, or it will rust!I bought this to use the 0.2mm gauge for my 3D printer. I left the enter oily set in the bag it came in, but removed the 0.2mm gauge. I then put that in a Ziploc bag with a folded paper towel into which I squirted some WD-40. I wipe it off with Isopropyl Alcohol before using, then back in the bag with the oil and paper towel. This is a really beautiful product and well worth the money.

What's good: - they were accurate and inexpensiveWhy these weren't a 5:1/2 star off for being a little tricky to read1 1/2 stars for being absolutely drenched in oil/grease -- literally dripping. I can see a little lubricant to keep them from sticking together but this was absurd!

Works well

Update: doh, that is, why didn’t I see something this obvious earlier: Just undo the bolt that holds the blades in the handle. Lay them out on a paper towel and use a couple more to remove the oil. They work fineOlder: Looked ok, but were covered in oil. I’ve bought plenty of other small metal items - files, measuring devices - from amazon and they all came wrapped in VOC paper, never in oil. I imagine the oil coating is a better rust preventative, but I need to measure violin string clearances next to the nut in tenths of a millimeter and I don’t need any oil residue contaminating the fingerboard. Rather than spending time laboriously scrubbing every piece of oil from every single feeler blade, I’m going to return this and try to find one that is shipped dry. Otherwise they looked like what I needed.

its covered in some type of oil that i'm assuming is suppose to be to protect it from rusting but makes it completely unusable 0/10