Metric Gauge Blocks

[Rutabagared]

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[MarkF]

http://www.wttool.com/product-exec/product_id/17590/nm/25_50_75_mm_Metric_Blocks_WT_Import_

Metric drill bits work well for me.

 

[Dave Ronyak]

Dominos are pretty close, too, but slightly above their nominal 5mm, 6mm, 8mm and 10mm thicknesses.

Drill bits are a great idea. 

Dave R.