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For the machinists and quality control folks who need precision: this is a Mitutoyo 1-inch square steel gage block.

It's Accuracy Grade 0, which means it's incredibly precise, used for setting up inspections or calibrating other tools.

The model number is 614201-531.

The best part is that it includes a certificate of accuracy, so you know it's right on the money.

It's brand new, in its original packaging, from Mitutoyo, a name that's trusted in machine shops everywhere.

It's a square block, 1 inch thick, ready to be the standard you compare everything else to.
5 out of 5