Ultra Precision 1-2-3 Blocks, Matched Pair

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