Accusize Industrial Tools Precision 81-Piece Steel Gauge Block Set, Grade B Accuracy, Corrosion-Resistant, P900-S581

Great purchase for my machine shop. Would recommend.

The blocks came wrapped in thin wax paper and coated in cosmoline or some other rust inhibiting substance (the blocks are made of steel - thus required). The "business ends" are polished to a mirror-like finish. The blocks wring together tightly. I have checked a few and they seem accurate enough for my needs. I've compared my results against the laminated spec sheet, of the ones I've checked... the serial numbers match up and the measurements seem to be accurate. Workshop grade gauge blocks should be accurate to 50 millionths of an inch, matching the accuracy of a quality micrometer. Overall, I'm satisfied! Would buy again.

God value for money and fine for general machining work.

If you are looking for a good quality master set for a clean inspection area, go with a higher precision grade.However, these make a great set for everyday shop use. If absolute precision is not necessary and they will be exposed to the workshop environment, an inexpensive set like this is just the ticket.Negative: They do not all wring together well, and certified dimensions on some did vary a bit farther than I would like from the nominal size.Positive: Inexpensive and comes with a certification displaying actual measurements of blocks.For a shop environment, I would highly recommend. For a master set in a clean environment, get a better set.

Wood box took a hard hit, before it was shipped to me based on how it was taped together prior to going into the amazon packaging. Box not perfect but ok. All blocks were serialized correctly vs the included chart. Each individually wrapped with corrosive inhibitor. I've measured maybe 50% with descent shop grade (Mitutoyo) indicators and they do seem correct. They also wring together well, including the larger inch plus sizes. Can you imagine the boredom of putting these kits together...

I've not had a chance to actually USE the blocks yet. They arrived promptly and were well packaged. The blocks are wrapped in rust-protective paper, and in a nice fitted wooden box. So far, the order meets expectations.

Ok, after reading some other reviews I was a little skeptical of these gage blocks. Since machining is just a hobby I decided to give them a try because of the price.The wooden box isn't a fine woodworking piece (I am a cabinet builder by trade) but arrived intact and seems well built and will certainly work for me. It did take me a couple hours to unwrap and clean all 81 blocks with alcohol, I watched youtube videos while doing this. After cleaning the blocks I wrung several sets together and measured with a micrometer and the measurements were mostly dead on. I did get a couple stacks of 6-8 blocks that came 0.0001 over, could be my micrometers calibration or my hand heating it up. Close enough for my hobby use.

Just as advertised!I work in QC and I brought a set for my own toolbox as I was tired of fishing through the two old incomplete sets we have every time I need to set a sine plate... After I brought a set, the company brought two more, one for the QC lab, one for the Milling department.Great price for a Working block set for surface plate setups, check fixturing, milling jaws to a specific gap, etc.Follow up: I see that some people had complaints about the box being poorly made. The boxes on the three sets that we have are solid and well made. Also, as others have said, the blocks are individually wrapped in oil paper to prevent rust. The engraving of the block is clear and very easy to read. And while I haven't checked every block, I have had no problem what so every, wringing blocks together. As I said initially, a great buy.