Drill jig
thingiverse
A Quick and Easy Way to Drill Pilot Holes in Planks. This handy jig is perfect for drilling precise pilot holes at the end of planks with ease. Currently designed for use with a 69 x 19 plank, it allows you to drill two 3mm holes either 35mm or 10mm from the edge of the board, and 15mm from both sides.
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