Precision 1-2-3 Blocks For Setup, Custom Fixtures And More

-2 blocks, each 1 inch by 2 inches by 3 inches
-Perfect for quickly checking for square
-The five holes at the bottom are threaded at 3/8-inch diameter with 16 threads
-Blocks can be bolted together to create a jig
-Heavy weight, each block weighs 1 lb, ground to .0003 of an inch tolerance

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