This is a simple Self–Centering Doweling Jig with an Aim you can make in less than an hour.
Here is a Free PDF Plan (courtesy of CrazyRussianWoodShop): https://1drv.ms/f/s!AslmFBP56EoIimCzm...
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Hilman Space at Lowes: https://www.lowes.com/pd/Hillman-3-8-...