Ultra Precision 1-2-3 Blocks, Matched Pair

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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 th readed 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 Show more