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2pcs Precision Blocks Hardened Steel 1-2-3 Blocks 0.0001" Precision Matched Machinist 123 Milling Tool 23 Holes 25-50-75mm Block - Gauges - AliExpress
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WEN 25 x 50 x 75 mm Steel-Hardened Metric Precision 123 Blocks, Two Pack in the Woodworking Tool Accessories department at Lowes.com
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Anytime Tools 1-2-3 Blocks Matched Pair Hardened Steel 23 Holes (1"x2"x3") 123 Set Precision Machinist Milling : Industrial & Scientific - Amazon.com
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BL-123 Pair of 1" x 2" x 3" Precision Steel 1-2-3 Blocks: Power Milling Machine Accessories: Amazon.com: Industrial & Scientific
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