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Four-Groove Hand Drill Squaring Block
A 60 x 60 x 50 mm block for drilling straight with a hand drill. Each side has a 90° V-groove cut the full height, including through the base, at depths of 2, 4, 6 and 8 mm. Set it on the work, rest the bit in the V that fits, and drill: any bit from about 1.5 mm up to about 20 mm stays square to the surface, so the block doesn't depend on any exact bit size.
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