Brown & Sharpe 599-750-10 - Ultra Precision Ground 1-2-3 Block Set
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Blocks are used to check the squareness of machine fences, table saw blades, drill press chucks, and any other 90-degree angle found in industrial shops. Due to their weight, they are unlikely to inadvertently shift while in use. The holes can be used as stop blocks and make them easy to attach to drill press tables and table saw jigs. They can be used as a square for applications under 3 inches.